From 0ca99a7f5e61d0bdcd99cbc21543f766bcaad874 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 17:03:07 +0900
Subject: [PATCH 01/18] remove legacy source

---
 packages/petite-vue-i18n/src/index.ts   |   1 -
 packages/petite-vue-i18n/src/runtime.ts |   1 -
 packages/vue-i18n-core/src/devtools.ts  |  42 +----
 packages/vue-i18n-core/src/i18n.ts      | 239 ++++--------------------
 packages/vue-i18n-core/src/index.ts     |   1 -
 packages/vue-i18n-core/src/misc.ts      |   4 -
 packages/vue-i18n-core/src/mixins.ts    | 216 ---------------------
 packages/vue-i18n-core/src/petite.ts    |   1 -
 packages/vue-i18n/src/index.ts          |   1 -
 packages/vue-i18n/src/runtime.ts        |   1 -
 10 files changed, 47 insertions(+), 460 deletions(-)
 delete mode 100644 packages/vue-i18n-core/src/mixins.ts

diff --git a/packages/petite-vue-i18n/src/index.ts b/packages/petite-vue-i18n/src/index.ts
index 5c4b915cb..da9cb0a51 100644
--- a/packages/petite-vue-i18n/src/index.ts
+++ b/packages/petite-vue-i18n/src/index.ts
@@ -70,7 +70,6 @@ export type {
   ExportedGlobalComposer,
   I18n,
   I18nAdditionalOptions,
-  I18nMode,
   I18nOptions,
   I18nPluginOptions,
   I18nScope,
diff --git a/packages/petite-vue-i18n/src/runtime.ts b/packages/petite-vue-i18n/src/runtime.ts
index d9d40abb9..6de23ca7e 100644
--- a/packages/petite-vue-i18n/src/runtime.ts
+++ b/packages/petite-vue-i18n/src/runtime.ts
@@ -71,7 +71,6 @@ export type {
   ExportedGlobalComposer,
   I18n,
   I18nAdditionalOptions,
-  I18nMode,
   I18nOptions,
   I18nPluginOptions,
   I18nScope,
diff --git a/packages/vue-i18n-core/src/devtools.ts b/packages/vue-i18n-core/src/devtools.ts
index 2ba48bce6..07b726e06 100644
--- a/packages/vue-i18n-core/src/devtools.ts
+++ b/packages/vue-i18n-core/src/devtools.ts
@@ -25,7 +25,6 @@ import type {
 import type { App, ComponentInternalInstance } from 'vue'
 import type { Composer } from './composer'
 import type { I18n, I18nInternal } from './i18n'
-import type { VueI18nInternal } from './legacy'
 
 type _I18n = I18n & I18nInternal
 
@@ -73,23 +72,10 @@ export async function enableDevTools(app: App, i18n: _I18n): Promise<boolean> {
               componentInstance.vnode.el.__VUE_I18N__ &&
               instanceData
             ) {
-              if (i18n.mode === 'legacy') {
-                // ignore global scope on legacy mode
-                if (
-                  componentInstance.vnode.el.__VUE_I18N__ !==
-                  (i18n.global as unknown as VueI18nInternal).__composer
-                ) {
-                  inspectComposer(
-                    instanceData,
-                    componentInstance.vnode.el.__VUE_I18N__ as Composer
-                  )
-                }
-              } else {
-                inspectComposer(
-                  instanceData,
-                  componentInstance.vnode.el.__VUE_I18N__ as Composer
-                )
-              }
+              inspectComposer(
+                instanceData,
+                componentInstance.vnode.el.__VUE_I18N__ as Composer
+              )
             }
           })
 
@@ -175,9 +161,7 @@ function updateComponentTreeTags(
   i18n: _I18n
 ): void {
   // prettier-ignore
-  const global = i18n.mode === 'composition'
-    ? i18n.global
-    : (i18n.global as unknown as VueI18nInternal).__composer
+  const global = i18n.global
   if (instance && instance.vnode.el && instance.vnode.el.__VUE_I18N__) {
     // add custom tags local scope only
     if (instance.vnode.el.__VUE_I18N__ !== global) {
@@ -295,14 +279,10 @@ function registerScope(
     label: 'Global Scope'
   })
   // prettier-ignore
-  const global = i18n.mode === 'composition'
-    ? i18n.global
-    : (i18n.global as unknown as VueI18nInternal).__composer
+  const global = i18n.global
   for (const [keyInstance, instance] of i18n.__instances) {
     // prettier-ignore
-    const composer = i18n.mode === 'composition'
-      ? instance
-      : (instance as unknown as VueI18nInternal).__composer
+    const composer = instance
     if (global === composer) {
       continue
     }
@@ -333,17 +313,13 @@ function getComponentInstance(
 
 function getComposer(nodeId: string, i18n: _I18n): Composer | null {
   if (nodeId === 'global') {
-    return i18n.mode === 'composition'
-      ? (i18n.global as unknown as Composer)
-      : (i18n.global as unknown as VueI18nInternal).__composer
+    return i18n.global
   } else {
     const instance = Array.from(i18n.__instances.values()).find(
       item => item.id.toString() === nodeId
     )
     if (instance) {
-      return i18n.mode === 'composition'
-        ? (instance as unknown as Composer)
-        : (instance as unknown as VueI18nInternal).__composer
+      return instance
     } else {
       return null
     }
diff --git a/packages/vue-i18n-core/src/i18n.ts b/packages/vue-i18n-core/src/i18n.ts
index 5978aebaa..599c11d1f 100644
--- a/packages/vue-i18n-core/src/i18n.ts
+++ b/packages/vue-i18n-core/src/i18n.ts
@@ -5,8 +5,7 @@ import {
   isEmptyObject,
   isPlainObject,
   makeSymbol,
-  warn,
-  warnOnce
+  warn
 } from '@intlify/shared'
 import {
   effectScope,
@@ -19,15 +18,8 @@ import {
 import { createComposer } from './composer'
 import { addTimelineEvent, enableDevTools } from './devtools'
 import { I18nErrorCodes, createI18nError } from './errors'
-import { createVueI18n } from './legacy'
-import { defineMixin } from './mixins'
 import { apply as applyPlugin } from './plugin/next'
-import {
-  DisableEmitter,
-  DisposeSymbol,
-  EnableEmitter,
-  InejctWithOptionSymbol
-} from './symbols'
+import { DisableEmitter, DisposeSymbol, EnableEmitter } from './symbols'
 import { adjustI18nResources, getComponentOptions } from './utils'
 import { I18nWarnCodes, getWarnMessage } from './warnings'
 
@@ -56,12 +48,6 @@ import type {
   DefaultNumberFormatSchema,
   VueMessageType
 } from './composer'
-import type {
-  VueI18n,
-  VueI18nExtender,
-  VueI18nInternal,
-  VueI18nOptions
-} from './legacy'
 import type { Disposer } from './types'
 
 /**
@@ -90,11 +76,7 @@ export type I18nOptions<
         numberFormats: unknown
       }
     | string = Locale,
-  Options extends
-    | ComposerOptions<Schema, Locales>
-    | VueI18nOptions<Schema, Locales> =
-    | ComposerOptions<Schema, Locales>
-    | VueI18nOptions<Schema, Locales>
+  Options = ComposerOptions<Schema, Locales>
 > = I18nAdditionalOptions & Options
 
 /**
@@ -106,19 +88,6 @@ export type I18nOptions<
  * @VueI18nGeneral
  */
 export interface I18nAdditionalOptions {
-  /**
-   * Whether vue-i18n Legacy API mode use on your Vue App
-   *
-   * @remarks
-   * The default is to use the Legacy API mode. If you want to use the Composition API mode, you need to set it to `false`.
-   *
-   * @deprecated will be removed at vue-i18n v12
-   *
-   * @VueI18nSee [Composition API](../../guide/advanced/composition)
-   *
-   * @defaultValue `true`
-   */
-  legacy?: boolean
   /**
    * Whether to inject global properties & functions into for each component.
    *
@@ -133,17 +102,6 @@ export interface I18nAdditionalOptions {
   globalInjection?: boolean
 }
 
-/**
- * Vue I18n API mode
- *
- * @deprecated will be removed at vue-i18n v12
- *
- * @VueI18nSee [I18n#mode](general#mode)
- *
- * @VueI18nGeneral
- */
-export type I18nMode = 'legacy' | 'composition'
-
 /**
  * I18n instance
  *
@@ -156,34 +114,15 @@ export interface I18n<
   Messages extends Record<string, unknown> = {},
   DateTimeFormats extends Record<string, unknown> = {},
   NumberFormats extends Record<string, unknown> = {},
-  OptionLocale = Locale,
-  Legacy = boolean
+  OptionLocale = Locale
 > {
-  /**
-   * Vue I18n API mode
-   *
-   * @remarks
-   * If you specified `legacy: true` option in `createI18n`, return `legacy`, else `composition`
-   *
-   * @deprecated will be removed at vue-i18n v12
-   *
-   * @defaultValue `'legacy'`
-   */
-  readonly mode: I18nMode
   // prettier-ignore
   /**
    * The property accessible to the global Composer instance or VueI18n instance
    *
-   * @remarks
-   * If the [I18n#mode](general#mode) is `'legacy'`, then you can access to a global {@link VueI18n} instance, else then [I18n#mode](general#mode) is `'composition' `, you can access to the global {@link Composer} instance.
-   *
    * An instance of this property is **global scope***.
    */
-  readonly global: Legacy extends true
-  ? VueI18n<Messages, DateTimeFormats, NumberFormats, OptionLocale>
-  : Legacy extends false
-  ? Composer<Messages, DateTimeFormats, NumberFormats, OptionLocale>
-  : unknown
+  readonly global: Composer<Messages, DateTimeFormats, NumberFormats, OptionLocale>
   /**
    * Install entry point
    *
@@ -207,10 +146,6 @@ export type ComposerExtender = (composer: Composer) => Disposer | undefined
  */
 type ExtendHooks = {
   __composerExtend?: ComposerExtender
-  /**
-   * @deprecated will be removed at vue-i18n v12
-   */
-  __vueI18nExtend?: VueI18nExtender
 }
 
 /**
@@ -226,30 +161,31 @@ export interface I18nInternal<
 > {
   __instances: Map<
     ComponentInternalInstance,
-    | VueI18n<Messages, DateTimeFormats, NumberFormats, OptionLocale>
-    | Composer<Messages, DateTimeFormats, NumberFormats, OptionLocale>
+    Composer<Messages, DateTimeFormats, NumberFormats, OptionLocale>
   >
   __getInstance<
-    Instance extends
-      | VueI18n<Messages, DateTimeFormats, NumberFormats, OptionLocale>
-      | Composer<Messages, DateTimeFormats, NumberFormats, OptionLocale>
+    Instance extends Composer<
+      Messages,
+      DateTimeFormats,
+      NumberFormats,
+      OptionLocale
+    >
   >(
     component: ComponentInternalInstance
   ): Instance | null
   __setInstance<
-    Instance extends
-      | VueI18n<Messages, DateTimeFormats, NumberFormats, OptionLocale>
-      | Composer<Messages, DateTimeFormats, NumberFormats, OptionLocale>
+    Instance extends Composer<
+      Messages,
+      DateTimeFormats,
+      NumberFormats,
+      OptionLocale
+    >
   >(
     component: ComponentInternalInstance,
     instance: Instance
   ): void
   __deleteInstance(component: ComponentInternalInstance): void
   __composerExtend?: ComposerExtender
-  /**
-   * @deprecated will be removed at vue-i18n v12
-   */
-  __vueI18nExtend?: VueI18nExtender
 }
 
 /**
@@ -322,7 +258,6 @@ export const I18nInjectionKey: InjectionKey<I18n> | string =
   /* #__PURE__*/ makeSymbol('global-vue-i18n')
 
 export function createI18n<
-  Legacy extends boolean = true,
   Options extends I18nOptions = I18nOptions,
   Messages extends Record<string, unknown> = Options['messages'] extends Record<
     string,
@@ -345,11 +280,7 @@ export function createI18n<
   OptionLocale = Options['locale'] extends string ? Options['locale'] : Locale
 >(
   options: Options
-): (typeof options)['legacy'] extends true
-  ? I18n<Messages, DateTimeFormats, NumberFormats, OptionLocale, true>
-  : (typeof options)['legacy'] extends false
-    ? I18n<Messages, DateTimeFormats, NumberFormats, OptionLocale, false>
-    : I18n<Messages, DateTimeFormats, NumberFormats, OptionLocale, Legacy>
+): I18n<Messages, DateTimeFormats, NumberFormats, OptionLocale>
 
 /**
  * Vue I18n factory
@@ -358,53 +289,19 @@ export function createI18n<
  *
  * @typeParam Schema - The i18n resources (messages, datetimeFormats, numberFormats) schema, default {@link LocaleMessage}
  * @typeParam Locales - The locales of i18n resource schema, default `en-US`
- * @typeParam Legacy - Whether legacy mode is enabled or disabled, default `true`
  *
  * @returns {@link I18n} instance
  *
- * @remarks
- * If you use Legacy API mode, you need to specify {@link VueI18nOptions} and `legacy: true` option.
- *
- * If you use composition API mode, you need to specify {@link ComposerOptions}.
- *
  * @VueI18nSee [Getting Started](../../guide/essentials/started)
  * @VueI18nSee [Composition API](../../guide/advanced/composition)
  *
  * @example
- * case: for Legacy API
- * ```js
- * import { createApp } from 'vue'
- * import { createI18n } from 'vue-i18n'
- *
- * // call with I18n option
- * const i18n = createI18n({
- *   locale: 'ja',
- *   messages: {
- *     en: { ... },
- *     ja: { ... }
- *   }
- * })
- *
- * const App = {
- *   // ...
- * }
- *
- * const app = createApp(App)
- *
- * // install!
- * app.use(i18n)
- * app.mount('#app')
- * ```
- *
- * @example
- * case: for composition API
  * ```js
  * import { createApp } from 'vue'
  * import { createI18n, useI18n } from 'vue-i18n'
  *
  * // call with I18n option
  * const i18n = createI18n({
- *   legacy: false, // you must specify 'legacy: false' option
  *   locale: 'ja',
  *   messages: {
  *     en: { ... },
@@ -432,7 +329,6 @@ export function createI18n<
 export function createI18n<
   Schema extends object = DefaultLocaleMessageSchema,
   Locales extends string | object = 'en-US',
-  Legacy extends boolean = true,
   Options extends I18nOptions<
     SchemaParams<Schema, VueMessageType>,
     LocaleParams<Locales>
@@ -455,45 +351,30 @@ export function createI18n<
   OptionLocale = Options['locale'] extends string ? Options['locale'] : Locale
 >(
   options: Options
-): (typeof options)['legacy'] extends true
-  ? I18n<Messages, DateTimeFormats, NumberFormats, OptionLocale, true>
-  : (typeof options)['legacy'] extends false
-    ? I18n<Messages, DateTimeFormats, NumberFormats, OptionLocale, false>
-    : I18n<Messages, DateTimeFormats, NumberFormats, OptionLocale, Legacy>
+): I18n<Messages, DateTimeFormats, NumberFormats, OptionLocale>
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 export function createI18n(options: any = {}): any {
   type _I18n = I18n & I18nInternal
 
-  // prettier-ignore
-  const __legacyMode = __LITE__
-    ? false
-    : __FEATURE_LEGACY_API__ && isBoolean(options.legacy)
-      ? options.legacy
-      : __FEATURE_LEGACY_API__
-
-  if (__DEV__ && __legacyMode) {
-    warnOnce(getWarnMessage(I18nWarnCodes.DEPRECATE_LEGACY_MODE))
-  }
-
   // prettier-ignore
   const __globalInjection = isBoolean(options.globalInjection)
     ? options.globalInjection
     : true
-  const __instances = new Map<ComponentInternalInstance, VueI18n | Composer>()
-  const [globalScope, __global] = createGlobal(options, __legacyMode)
+  const __instances = new Map<ComponentInternalInstance, Composer>()
+  const [globalScope, __global] = createGlobal(options)
   const symbol: InjectionKey<I18n> | string = /* #__PURE__*/ makeSymbol(
     __DEV__ ? 'vue-i18n' : ''
   )
 
-  function __getInstance<Instance extends VueI18n | Composer>(
+  function __getInstance(
     component: ComponentInternalInstance
-  ): Instance | null {
-    return (__instances.get(component) as unknown as Instance) || null
+  ): Composer | null {
+    return __instances.get(component) || null
   }
-  function __setInstance<Instance extends VueI18n | Composer>(
+  function __setInstance(
     component: ComponentInternalInstance,
-    instance: Instance
+    instance: Composer
   ): void {
     __instances.set(component, instance)
   }
@@ -503,10 +384,8 @@ export function createI18n(options: any = {}): any {
 
   const i18n = {
     // mode
-    get mode(): I18nMode {
-      return !__LITE__ && __FEATURE_LEGACY_API__ && __legacyMode
-        ? 'legacy'
-        : 'composition'
+    get mode() {
+      return 'composition'
     },
     // install plugin
     async install(app: App, ...options: unknown[]): Promise<void> {
@@ -525,14 +404,12 @@ export function createI18n(options: any = {}): any {
         // so we keep it temporary
         ;(i18n as unknown as I18nInternal).__composerExtend =
           opts.__composerExtend
-        ;(i18n as unknown as I18nInternal).__vueI18nExtend =
-          opts.__vueI18nExtend
       }
 
       // global method and properties injection for Composition API
       let globalReleaseHandler: ReturnType<typeof injectGlobalFields> | null =
         null
-      if (!__legacyMode && __globalInjection) {
+      if (__globalInjection) {
         globalReleaseHandler = injectGlobalFields(app, i18n.global as Composer)
       }
 
@@ -541,17 +418,6 @@ export function createI18n(options: any = {}): any {
         applyPlugin(app, ...options)
       }
 
-      // setup mixin for Legacy API
-      if (!__LITE__ && __FEATURE_LEGACY_API__ && __legacyMode) {
-        app.mixin(
-          defineMixin(
-            __global as unknown as VueI18n,
-            (__global as unknown as VueI18nInternal).__composer as Composer,
-            i18n as unknown as I18nInternal
-          )
-        )
-      }
-
       // release global scope
       const unmountApp = app.unmount
       app.unmount = () => {
@@ -568,14 +434,9 @@ export function createI18n(options: any = {}): any {
         }
         const emitter: VueDevToolsEmitter =
           createEmitter<VueDevToolsEmitterEvents>()
-        if (__legacyMode) {
-          const _vueI18n = __global as unknown as VueI18nInternal
-          _vueI18n.__enableEmitter && _vueI18n.__enableEmitter(emitter)
-        } else {
-          // eslint-disable-next-line @typescript-eslint/no-explicit-any
-          const _composer = __global as any
-          _composer[EnableEmitter] && _composer[EnableEmitter](emitter)
-        }
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        const _composer = __global as any
+        _composer[EnableEmitter] && _composer[EnableEmitter](emitter)
         emitter.on('*', addTimelineEvent)
       }
     },
@@ -767,15 +628,9 @@ export function useI18n<
   >
 }
 
-function createGlobal(
-  options: I18nOptions,
-  legacyMode: boolean
-): [EffectScope, VueI18n | Composer] {
+function createGlobal(options: I18nOptions): [EffectScope, Composer] {
   const scope = effectScope()
-  const obj =
-    !__LITE__ && __FEATURE_LEGACY_API__ && legacyMode
-      ? scope.run(() => createVueI18n(options))
-      : scope.run(() => createComposer(options))
+  const obj = scope.run(() => createComposer(options))
   if (obj == null) {
     throw createI18nError(I18nErrorCodes.UNEXPECTED_ERROR)
   }
@@ -813,9 +668,7 @@ function getScope(options: UseI18nOptions, componentOptions: any): I18nScope {
 
 function getGlobalComposer(i18n: I18n): Composer {
   // prettier-ignore
-  return i18n.mode === 'composition'
-    ? (i18n.global as unknown as Composer)
-    : (i18n.global as unknown as VueI18nInternal).__composer
+  return i18n.global
 }
 
 function getComposer(
@@ -831,24 +684,8 @@ function getComposer(
   )
   while (current != null) {
     const i18nInternal = i18n as unknown as I18nInternal
-    if (i18n.mode === 'composition') {
-      composer = i18nInternal.__getInstance(current)
-    } else {
-      if (!__LITE__ && __FEATURE_LEGACY_API__) {
-        const vueI18n = i18nInternal.__getInstance(current)
-        if (vueI18n != null) {
-          composer = (vueI18n as VueI18n & VueI18nInternal)
-            .__composer as Composer
-          if (
-            useComponent &&
-            composer &&
-            !(composer as any)[InejctWithOptionSymbol] // eslint-disable-line @typescript-eslint/no-explicit-any
-          ) {
-            composer = null
-          }
-        }
-      }
-    }
+    composer = i18nInternal.__getInstance(current)
+
     if (composer != null) {
       break
     }
diff --git a/packages/vue-i18n-core/src/index.ts b/packages/vue-i18n-core/src/index.ts
index 18940c5c4..ab87baa54 100644
--- a/packages/vue-i18n-core/src/index.ts
+++ b/packages/vue-i18n-core/src/index.ts
@@ -76,7 +76,6 @@ export type {
   ExportedGlobalComposer,
   I18n,
   I18nAdditionalOptions,
-  I18nMode,
   I18nOptions,
   I18nScope,
   UseI18nOptions
diff --git a/packages/vue-i18n-core/src/misc.ts b/packages/vue-i18n-core/src/misc.ts
index 67640a09c..71f8d8b4c 100644
--- a/packages/vue-i18n-core/src/misc.ts
+++ b/packages/vue-i18n-core/src/misc.ts
@@ -21,10 +21,6 @@ export function initFeatureFlags(): void {
     getGlobalThis().__VUE_I18N_FULL_INSTALL__ = true
   }
 
-  if (typeof __FEATURE_LEGACY_API__ !== 'boolean') {
-    getGlobalThis().__VUE_I18N_LEGACY_API__ = true
-  }
-
   if (typeof __FEATURE_DROP_MESSAGE_COMPILER__ !== 'boolean') {
     getGlobalThis().__INTLIFY_DROP_MESSAGE_COMPILER__ = false
   }
diff --git a/packages/vue-i18n-core/src/mixins.ts b/packages/vue-i18n-core/src/mixins.ts
deleted file mode 100644
index 6794aca8c..000000000
--- a/packages/vue-i18n-core/src/mixins.ts
+++ /dev/null
@@ -1,216 +0,0 @@
-import { createEmitter } from '@intlify/shared'
-import { getCurrentInstance } from 'vue'
-import { addTimelineEvent } from './devtools'
-import { createI18nError, I18nErrorCodes } from './errors'
-import { createVueI18n } from './legacy'
-import { SetPluralRulesSymbol } from './symbols'
-import { adjustI18nResources, getLocaleMessages } from './utils'
-
-import type { Locale, LocaleMessageValue } from '@intlify/core'
-import type { Path } from '@intlify/core-base'
-import type {
-  VueDevToolsEmitter,
-  VueDevToolsEmitterEvents
-} from '@intlify/devtools-types'
-import type { ComponentOptions } from 'vue'
-import type {
-  Composer,
-  ComposerInternalOptions,
-  ComposerOptions,
-  VueMessageType
-} from './composer'
-import type { I18nInternal } from './i18n'
-import type {
-  DateTimeFormatResult,
-  NumberFormatResult,
-  TranslateResult,
-  VueI18n,
-  VueI18nInternal,
-  VueI18nInternalOptions,
-  VueI18nOptions
-} from './legacy'
-
-/**
- * Supports compatibility for legacy vue-i18n APIs
- * This mixin is used when we use vue-i18n@v9.x or later
- */
-export function defineMixin(
-  vuei18n: VueI18n,
-  composer: Composer,
-  i18n: I18nInternal
-): ComponentOptions {
-  return {
-    beforeCreate(): void {
-      const instance = getCurrentInstance()
-      /* istanbul ignore if */
-      if (!instance) {
-        throw createI18nError(I18nErrorCodes.UNEXPECTED_ERROR)
-      }
-
-      const options = this.$options
-      if (options.i18n) {
-        const optionsI18n = options.i18n as VueI18nOptions &
-          VueI18nInternalOptions &
-          ComposerInternalOptions
-
-        if (options.__i18n) {
-          optionsI18n.__i18n = options.__i18n
-        }
-        optionsI18n.__root = composer
-        if (this === this.$root) {
-          // merge option and gttach global
-          this.$i18n = mergeToGlobal(vuei18n, optionsI18n)
-        } else {
-          optionsI18n.__injectWithOption = true
-          optionsI18n.__extender = i18n.__vueI18nExtend
-          // atttach local VueI18n instance
-          this.$i18n = createVueI18n(optionsI18n)
-          // extend VueI18n instance
-          const _vueI18n = this.$i18n as unknown as VueI18nInternal
-          if (_vueI18n.__extender) {
-            _vueI18n.__disposer = _vueI18n.__extender(this.$i18n)
-          }
-        }
-      } else if (options.__i18n) {
-        if (this === this.$root) {
-          // merge option and gttach global
-          this.$i18n = mergeToGlobal(vuei18n, options)
-        } else {
-          // atttach local VueI18n instance
-          this.$i18n = createVueI18n({
-            __i18n: (options as ComposerInternalOptions).__i18n,
-            __injectWithOption: true,
-            __extender: i18n.__vueI18nExtend,
-            __root: composer
-          } as VueI18nOptions & VueI18nInternalOptions)
-          // extend VueI18n instance
-          const _vueI18n = this.$i18n as unknown as VueI18nInternal
-          if (_vueI18n.__extender) {
-            _vueI18n.__disposer = _vueI18n.__extender(this.$i18n)
-          }
-        }
-      } else {
-        // attach global VueI18n instance
-        this.$i18n = vuei18n
-      }
-
-      if (options.__i18nGlobal) {
-        adjustI18nResources(composer, options as ComposerOptions, options)
-      }
-
-      // defines vue-i18n legacy APIs
-      this.$t = (...args: unknown[]): TranslateResult => this.$i18n.t(...args)
-      this.$rt = (...args: unknown[]): TranslateResult => this.$i18n.rt(...args)
-      this.$te = (key: Path, locale?: Locale): boolean =>
-        this.$i18n.te(key, locale)
-      this.$d = (...args: unknown[]): DateTimeFormatResult =>
-        this.$i18n.d(...args)
-      this.$n = (...args: unknown[]): NumberFormatResult =>
-        this.$i18n.n(...args)
-      this.$tm = (key: Path): LocaleMessageValue<VueMessageType> | {} =>
-        this.$i18n.tm(key)
-
-      i18n.__setInstance(instance, this.$i18n as VueI18n)
-    },
-
-    mounted(): void {
-      /* istanbul ignore if */
-      if (
-        (__DEV__ || __FEATURE_PROD_VUE_DEVTOOLS__) &&
-        !__NODE_JS__ &&
-        this.$el &&
-        this.$i18n
-      ) {
-        const _vueI18n = this.$i18n as unknown as VueI18nInternal
-        this.$el.__VUE_I18N__ = _vueI18n.__composer
-        const emitter: VueDevToolsEmitter = (this.__v_emitter =
-          createEmitter<VueDevToolsEmitterEvents>())
-        _vueI18n.__enableEmitter && _vueI18n.__enableEmitter(emitter)
-        emitter.on('*', addTimelineEvent)
-      }
-    },
-
-    unmounted(): void {
-      const instance = getCurrentInstance()
-      /* istanbul ignore if */
-      if (!instance) {
-        throw createI18nError(I18nErrorCodes.UNEXPECTED_ERROR)
-      }
-
-      const _vueI18n = this.$i18n as unknown as VueI18nInternal
-
-      /* istanbul ignore if */
-      if (
-        (__DEV__ || __FEATURE_PROD_VUE_DEVTOOLS__) &&
-        !__NODE_JS__ &&
-        this.$el &&
-        this.$el.__VUE_I18N__
-      ) {
-        if (this.__v_emitter) {
-          this.__v_emitter.off('*', addTimelineEvent)
-          delete this.__v_emitter
-        }
-        if (this.$i18n) {
-          _vueI18n.__disableEmitter && _vueI18n.__disableEmitter()
-          delete this.$el.__VUE_I18N__
-        }
-      }
-
-      delete this.$t
-      delete this.$rt
-      delete this.$te
-      delete this.$d
-      delete this.$n
-      delete this.$tm
-
-      if (_vueI18n.__disposer) {
-        _vueI18n.__disposer()
-        delete _vueI18n.__disposer
-        delete _vueI18n.__extender
-      }
-
-      i18n.__deleteInstance(instance)
-      delete this.$i18n
-    }
-  }
-}
-
-function mergeToGlobal(
-  g: VueI18n,
-  options: VueI18nOptions & ComposerInternalOptions
-): VueI18n {
-  g.locale = options.locale || g.locale
-  g.fallbackLocale = options.fallbackLocale || g.fallbackLocale
-  g.missing = options.missing || g.missing
-  g.silentTranslationWarn =
-    options.silentTranslationWarn || g.silentFallbackWarn
-  g.silentFallbackWarn = options.silentFallbackWarn || g.silentFallbackWarn
-  g.formatFallbackMessages =
-    options.formatFallbackMessages || g.formatFallbackMessages
-  g.postTranslation = options.postTranslation || g.postTranslation
-  g.warnHtmlInMessage = options.warnHtmlInMessage || g.warnHtmlInMessage
-  g.escapeParameterHtml = options.escapeParameterHtml || g.escapeParameterHtml
-  g.sync = options.sync || g.sync
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  ;(g as any).__composer[SetPluralRulesSymbol](
-    options.pluralizationRules || g.pluralizationRules
-  )
-  const messages = getLocaleMessages(g.locale as Locale, {
-    messages: options.messages,
-    __i18n: options.__i18n
-  })
-  Object.keys(messages).forEach(locale =>
-    g.mergeLocaleMessage(locale, messages[locale])
-  )
-  if (options.datetimeFormats) {
-    Object.keys(options.datetimeFormats).forEach(locale =>
-      g.mergeDateTimeFormat(locale, options.datetimeFormats![locale])
-    )
-  }
-  if (options.numberFormats) {
-    Object.keys(options.numberFormats).forEach(locale =>
-      g.mergeNumberFormat(locale, options.numberFormats![locale])
-    )
-  }
-  return g
-}
diff --git a/packages/vue-i18n-core/src/petite.ts b/packages/vue-i18n-core/src/petite.ts
index bb80756fd..c3031f00d 100644
--- a/packages/vue-i18n-core/src/petite.ts
+++ b/packages/vue-i18n-core/src/petite.ts
@@ -58,7 +58,6 @@ export type {
   ExportedGlobalComposer,
   I18n,
   I18nAdditionalOptions,
-  I18nMode,
   I18nOptions,
   I18nScope,
   UseI18nOptions
diff --git a/packages/vue-i18n/src/index.ts b/packages/vue-i18n/src/index.ts
index dca19b3d1..409f75fc1 100644
--- a/packages/vue-i18n/src/index.ts
+++ b/packages/vue-i18n/src/index.ts
@@ -91,7 +91,6 @@ export type {
   I18n,
   I18nAdditionalOptions,
   I18nD,
-  I18nMode,
   I18nN,
   I18nOptions,
   I18nPluginOptions,
diff --git a/packages/vue-i18n/src/runtime.ts b/packages/vue-i18n/src/runtime.ts
index 76e24f07f..72664e491 100644
--- a/packages/vue-i18n/src/runtime.ts
+++ b/packages/vue-i18n/src/runtime.ts
@@ -90,7 +90,6 @@ export type {
   I18n,
   I18nAdditionalOptions,
   I18nD,
-  I18nMode,
   I18nN,
   I18nOptions,
   I18nPluginOptions,

From 8164fef68bb2787a65c4428cf07fb22dc830f09c Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 17:37:52 +0900
Subject: [PATCH 02/18] fix test

---
 packages/vue-i18n-core/test/i18n.test-d.ts |  82 +--
 packages/vue-i18n-core/test/i18n.test.ts   | 628 +--------------------
 packages/vue-i18n-core/test/issues.test.ts | 280 ---------
 packages/vue-i18n-core/test/mixin.test.ts  | 264 ---------
 packages/vue-i18n-core/test/wc.test.ts     |   6 +-
 5 files changed, 50 insertions(+), 1210 deletions(-)
 delete mode 100644 packages/vue-i18n-core/test/mixin.test.ts

diff --git a/packages/vue-i18n-core/test/i18n.test-d.ts b/packages/vue-i18n-core/test/i18n.test-d.ts
index fc3d7d62a..7d02780a7 100644
--- a/packages/vue-i18n-core/test/i18n.test-d.ts
+++ b/packages/vue-i18n-core/test/i18n.test-d.ts
@@ -7,6 +7,7 @@ import type {
   PickupFallbackLocales
 } from '@intlify/core-base'
 import type { MyDatetimeScehma, MyNumberSchema, ResourceSchema } from './schema'
+import { ComputedRef, WritableComputedRef } from 'vue'
 
 beforeEach(() => {
   // allow mocking
@@ -54,7 +55,6 @@ const looseOptions = {
 // strict options
 const strictOptions = {
   locale: 'en',
-  legacy: false,
   fallbackLocale: {
     ja: ['en']
   },
@@ -309,8 +309,7 @@ test('local scope without type annotation at useI18n', () => {
 test('loose i18n', () => {
   // with object spread and composer
   const looseI18nComposer = createI18n({
-    ...looseOptions,
-    legacy: false
+    ...looseOptions
   }).global
 
   expectTypeOf(looseI18nComposer.locale.value).toEqualTypeOf<
@@ -346,41 +345,49 @@ test('loose i18n', () => {
 
   const looseI18n = createI18n(looseOptions).global
   expectTypeOf(looseI18n.locale).toEqualTypeOf<
-    'en' | 'ja' | 'en-US' | 'ja-JP'
+    WritableComputedRef<'en' | 'ja' | 'en-US' | 'ja-JP'>
   >()
   expectTypeOf(looseI18n.fallbackLocale).toEqualTypeOf<
-    | 'en'
-    | 'ja'
-    | 'en-US'
-    | 'ja-JP'
-    | ('en' | 'ja' | 'en-US' | 'ja-JP')[]
-    | {
-        [x in string]: PickupFallbackLocales<
-          ['en' | 'ja' | 'en-US' | 'ja-JP']
-        >[]
-      }
-    | false
+    WritableComputedRef<
+      | 'en'
+      | 'ja'
+      | 'en-US'
+      | 'ja-JP'
+      | ('en' | 'ja' | 'en-US' | 'ja-JP')[]
+      | {
+          [x in string]: PickupFallbackLocales<
+            ['en' | 'ja' | 'en-US' | 'ja-JP']
+          >[]
+        }
+      | false
+    >
   >()
-  expectTypeOf(looseI18n.messages).toEqualTypeOf<{
-    en: {
-      foo: string
-      nest: {
-        bar: string
+  expectTypeOf(looseI18n.messages).toEqualTypeOf<
+    ComputedRef<{
+      en: {
+        foo: string
+        nest: {
+          bar: string
+        }
       }
-    }
-    ja: {
-      bar: string
-      nest: {
+      ja: {
         bar: string
+        nest: {
+          bar: string
+        }
       }
-    }
-  }>()
-  expectTypeOf(looseI18n.datetimeFormats).toEqualTypeOf<{
-    'en-US': { short: {} }
-  }>()
-  expectTypeOf(looseI18n.numberFormats).toEqualTypeOf<{
-    'ja-JP': { currency: {} }
-  }>()
+    }>
+  >()
+  expectTypeOf(looseI18n.datetimeFormats).toEqualTypeOf<
+    ComputedRef<{
+      'en-US': { short: {} }
+    }>
+  >()
+  expectTypeOf(looseI18n.numberFormats).toEqualTypeOf<
+    ComputedRef<{
+      'ja-JP': { currency: {} }
+    }>
+  >()
   expectTypeOf(looseI18n.t('nest.bar')).toEqualTypeOf<string>()
   expectTypeOf(looseI18n.t('nest', 'en')).toEqualTypeOf<string>()
   expectTypeOf(looseI18n.t('foo', [1])).toEqualTypeOf<string>()
@@ -399,7 +406,7 @@ test('loose i18n', () => {
   >()
   expectTypeOf(looseI18n.rt('foo')).toEqualTypeOf<string>()
   expectTypeOf(looseI18n.getLocaleMessage('en')).toEqualTypeOf<
-    typeof looseI18n.messages.en
+    typeof looseI18n.messages.value.en
   >()
   expectTypeOf(
     looseI18n.getLocaleMessage<{ japan: string }>('japan')
@@ -423,7 +430,7 @@ test('loose i18n', () => {
   })
 
   expectTypeOf(looseI18n.getDateTimeFormat('en-US')).toEqualTypeOf<
-    (typeof looseI18n.datetimeFormats)['en-US']
+    (typeof looseI18n.datetimeFormats.value)['en-US']
   >()
   expectTypeOf(
     looseI18n.getLocaleMessage<{ long: { hour: string } }>('en-US')
@@ -445,7 +452,7 @@ test('loose i18n', () => {
   })
 
   expectTypeOf(looseI18n.getNumberFormat('ja-JP')).toEqualTypeOf<
-    (typeof looseI18n.numberFormats)['ja-JP']
+    (typeof looseI18n.numberFormats.value)['ja-JP']
   >()
   expectTypeOf(
     looseI18n.getNumberFormat<{ weight: { unit: string } }>('en-US')
@@ -470,7 +477,7 @@ test('loose i18n', () => {
 })
 
 test('strict i18n', () => {
-  const strictI18n = createI18n<[ResourceSchema], 'en' | 'ja', false>(
+  const strictI18n = createI18n<[ResourceSchema], 'en' | 'ja'>(
     strictOptions
   ).global
 
@@ -548,8 +555,7 @@ test('strict i18n with direct i18n options', () => {
       datetime: MyDatetimeScehma
       number: MyNumberSchema
     },
-    { messages: 'en'; datetimeFormats: 'ja-JP' | 'zh'; numberFormats: 'ca' },
-    false
+    { messages: 'en'; datetimeFormats: 'ja-JP' | 'zh'; numberFormats: 'ca' }
   >({
     messages: {
       en: {
diff --git a/packages/vue-i18n-core/test/i18n.test.ts b/packages/vue-i18n-core/test/i18n.test.ts
index 3826dcdf8..cd265f895 100644
--- a/packages/vue-i18n-core/test/i18n.test.ts
+++ b/packages/vue-i18n-core/test/i18n.test.ts
@@ -39,7 +39,6 @@ import type { IntlifyDevToolsEmitterHooks } from '@intlify/devtools-types'
 import type { App, ComponentOptions } from 'vue'
 import type { Composer } from '../src/composer'
 import type { I18n } from '../src/i18n'
-import type { VueI18n } from '../src/legacy'
 /* eslint-disable @typescript-eslint/no-explicit-any */
 // allow any in error
 const container = document.createElement('div')
@@ -59,38 +58,9 @@ afterEach(() => {
   setDevToolsHook(null)
 })
 
-describe('createI18n', () => {
-  test('legacy mode', () => {
-    const i18n = createI18n({})
-
-    expect(i18n.mode).toEqual('legacy')
-  })
-
-  test('composition mode', () => {
-    const i18n = createI18n({
-      legacy: false
-    })
-
-    expect(i18n.mode).toEqual('composition')
-  })
-})
-
 describe('createI18n with flat json messages', () => {
-  test('legacy mode', () => {
-    const i18n = createI18n({
-      flatJson: true,
-      messages: {
-        en: { 'mainMenu.buttonStart': 'Start!' }
-      }
-    })
-    const messages = i18n.global.messages
-    // @ts-ignore
-    expect(messages.en.mainMenu.buttonStart).toEqual('Start!')
-  })
-
   test('composition mode', () => {
-    const i18n = createI18n<false>({
-      legacy: false,
+    const i18n = createI18n({
       flatJson: true,
       messages: {
         en: { 'mainMenu.buttonStart': 'Start!' }
@@ -116,7 +86,6 @@ describe('useI18n', () => {
 
   test('basic', async () => {
     const i18n = createI18n({
-      legacy: false,
       locale: 'ja',
       messages: {
         en: {
@@ -149,7 +118,6 @@ describe('useI18n', () => {
 
   test('global scope', async () => {
     const i18n = createI18n({
-      legacy: false,
       locale: 'ja',
       messages: {
         en: {
@@ -172,35 +140,8 @@ describe('useI18n', () => {
     expect((composer as Composer).locale.value).toEqual('ja')
   })
 
-  test('global scope with legacy mode', async () => {
-    const i18n = createI18n({
-      allowComposition: true,
-      legacy: true,
-      locale: 'en',
-      messages: {
-        en: {
-          hello: 'hello!'
-        }
-      }
-    })
-
-    const App = defineComponent({
-      setup() {
-        const { locale, t } = useI18n({
-          useScope: 'global'
-        })
-        return { locale, t }
-      },
-      i18n: {},
-      template: `<p>{{ locale }}:{{ t('hello') }}</p>`
-    })
-    const { html } = await mount(App, i18n)
-    expect(html()).toEqual('<p>en:hello!</p>')
-  })
-
   test('parent scope', async () => {
     const i18n = createI18n({
-      legacy: false,
       locale: 'ja',
       messages: {
         en: {
@@ -245,7 +186,6 @@ describe('useI18n', () => {
 
   test('not found parent composer with parent scope', async () => {
     const i18n = createI18n({
-      legacy: false,
       locale: 'ja',
       messages: {
         en: {
@@ -278,7 +218,6 @@ describe('useI18n', () => {
 
   test('empty options', async () => {
     const i18n = createI18n({
-      legacy: false,
       locale: 'ja',
       messages: {
         en: {
@@ -303,7 +242,6 @@ describe('useI18n', () => {
 
   test('empty options, when have i18n custom blocks', async () => {
     const i18n = createI18n({
-      legacy: false,
       locale: 'ja',
       messages: {
         en: {
@@ -354,7 +292,6 @@ describe('useI18n', () => {
 
   test(errorMessages[I18nErrorCodes.NOT_INSTALLED], async () => {
     const i18n = createI18n({
-      legacy: false,
       locale: 'ja',
       messages: {
         en: {
@@ -378,224 +315,12 @@ describe('useI18n', () => {
     expect(error).toEqual(errorMessages[I18nErrorCodes.NOT_INSTALLED])
   })
 
-  describe('On legacy', () => {
-    describe('enable', () => {
-      describe('t', () => {
-        test('translation & locale changing', async () => {
-          const i18n = createI18n({
-            allowComposition: true,
-            locale: 'ja',
-            messages: {
-              en: {
-                hello: 'hello!'
-              },
-              ja: {
-                hello: 'こんにちは！'
-              }
-            }
-          })
-
-          const App = defineComponent({
-            setup() {
-              const { locale, t } = useI18n()
-              return { locale, t }
-            },
-            template: `<p>{{ t('hello') }}</p>`
-          })
-          const { html } = await mount(App, i18n)
-          expect(html()).toEqual('<p>こんにちは！</p>')
-
-          i18n.global.locale = 'en'
-          await nextTick()
-          expect(html()).toEqual('<p>hello!</p>')
-        })
-
-        test('local scope', async () => {
-          const i18n = createI18n({
-            allowComposition: true,
-            locale: 'en',
-            messages: {
-              en: {
-                hello: 'hello!'
-              },
-              ja: {}
-            }
-          })
-
-          const App = defineComponent({
-            setup() {
-              const { locale, t } = useI18n({
-                useScope: 'local',
-                messages: {
-                  en: {
-                    world: 'world!'
-                  },
-                  ja: {
-                    world: '世界！'
-                  }
-                }
-              })
-              return { locale, t }
-            },
-            i18n: {},
-            template: `<p>{{ locale }}:{{ t('world') }}</p>`
-          })
-          const { html } = await mount(App, i18n)
-          expect(html()).toEqual('<p>en:world!</p>')
-
-          i18n.global.locale = 'ja'
-          await nextTick()
-          expect(html()).toEqual('<p>ja:世界！</p>')
-        })
-
-        test('use custom block', async () => {
-          const i18n = createI18n({
-            allowComposition: true,
-            locale: 'ja',
-            messages: {
-              en: {
-                hello: 'hello!'
-              },
-              ja: {}
-            }
-          })
-
-          const App = defineComponent({
-            setup() {
-              const instance = getCurrentInstance()
-              if (instance == null) {
-                throw new Error()
-              }
-              const options = instance.type as ComponentOptions
-              options.__i18n = [
-                {
-                  locale: 'ja',
-                  resource: {
-                    hello: 'こんにちは!'
-                  }
-                }
-              ]
-              const { locale, t } = useI18n({
-                inheritLocale: true,
-                useScope: 'local'
-              })
-              return { locale, t }
-            },
-            template: `<p>{{ locale }}:{{ t('hello') }}</p>`
-          })
-          const { html } = await mount(App, i18n)
-          expect(html()).toEqual('<p>ja:こんにちは!</p>')
-        })
-      })
-    })
-
-    describe('d', () => {
-      test('datetime formatting', async () => {
-        const i18n = createI18n({
-          allowComposition: true,
-          locale: 'en-US',
-          fallbackLocale: ['ja-JP'],
-          datetimeFormats: {
-            'en-US': {
-              short: {
-                year: 'numeric',
-                month: '2-digit',
-                day: '2-digit',
-                hour: '2-digit',
-                minute: '2-digit',
-                timeZone: 'America/New_York'
-              }
-            },
-            'ja-JP': {
-              long: {
-                year: 'numeric',
-                month: '2-digit',
-                day: '2-digit',
-                hour: '2-digit',
-                minute: '2-digit',
-                second: '2-digit',
-                timeZone: 'Asia/Tokyo'
-              },
-              short: {
-                year: 'numeric',
-                month: '2-digit',
-                day: '2-digit',
-                hour: '2-digit',
-                minute: '2-digit',
-                timeZone: 'Asia/Tokyo'
-              }
-            }
-          }
-        })
-
-        const App = defineComponent({
-          setup() {
-            const { d } = useI18n()
-            const dt = new Date(Date.UTC(2012, 11, 20, 3, 0, 0))
-            return { d, dt }
-          },
-          template: `<p>{{ d(dt, 'long') }}</p>`
-        })
-        const { html } = await mount(App, i18n)
-        expect(html()).toEqual('<p>2012/12/20 12:00:00</p>')
-      })
-    })
-
-    describe('n', () => {
-      test('number formatting', async () => {
-        const i18n = createI18n({
-          allowComposition: true,
-          locale: 'en-US',
-          fallbackLocale: ['ja-JP'],
-          numberFormats: {
-            'en-US': {
-              currency: {
-                style: 'currency',
-                currency: 'USD',
-                currencyDisplay: 'symbol'
-              },
-              decimal: {
-                style: 'decimal',
-                useGrouping: false
-              }
-            },
-            'ja-JP': {
-              currency: {
-                style: 'currency',
-                currency: 'JPY' /*, currencyDisplay: 'symbol'*/
-              },
-              numeric: {
-                style: 'decimal',
-                useGrouping: false
-              },
-              percent: {
-                style: 'percent',
-                useGrouping: false
-              }
-            }
-          }
-        })
-
-        const App = defineComponent({
-          setup() {
-            const { n } = useI18n()
-            const value = 0.99
-            return { n, value }
-          },
-          template: `<p>{{ n(value, { key: 'percent' }) }}</p>`
-        })
-        const { html } = await mount(App, i18n)
-        expect(html()).toEqual('<p>99%</p>')
-      })
-    })
-  })
-
   test(errorMessages[I18nErrorCodes.NOT_INSTALLED_WITH_PROVIDE], async () => {
     const randCusumerTag = `my-consumer-${randStr()}`
     const randProviderTag = `my-provider-${randStr()}`
     const Provider = defineCustomElement({
       setup() {
-        createI18n<false>({ legacy: false })
+        createI18n({})
         return () => h(randCusumerTag)
       }
     })
@@ -635,93 +360,8 @@ describe('slot reactivity', () => {
     console.warn = org
   })
 
-  test('legacy', async () => {
-    const i18n = createI18n({
-      locale: 'ja',
-      fallbackLocale: ['en'],
-      messages: {
-        en: {
-          hello: 'hello!'
-        },
-        ja: {
-          hello: 'こんにちは！'
-        }
-      }
-    })
-
-    const SlotChild = {
-      template: `<p><slot/></p>`
-    }
-
-    const SubChild = {
-      template: `
-        <div class="sub-child">
-          <h1>Sub Child</h1>
-          <form>
-            <select v-model="$i18n.locale">
-              <option value="en">en</option>
-              <option value="ja">ja</option>
-            </select>
-          </form>
-          <p>{{ $t('hello') }}</p>
-        </div>
-      `
-    }
-
-    const Child = {
-      components: {
-        SubChild,
-        SlotChild
-      },
-      template: `
-        <div class="child">
-          <h1>Child</h1>
-          <form>
-            <select v-model="$i18n.locale">
-              <option value="en">en</option>
-              <option value="ja">ja</option>
-            </select>
-          </form>
-          <p>{{ $t('hello') }}</p>
-          <SubChild />
-          $t inside of slot
-          <SlotChild>
-            {{ $t('hello') }}
-          </SlotChild>
-          i18n-t inside of slot
-          <SlotChild>
-            <i18n-t keypath='hello'/>
-          </SlotChild>
-        </div>
-      `
-    }
-
-    const App = defineComponent({
-      components: {
-        Child
-      },
-      template: `
-        <h1>Root</h1>
-          <form>
-            <select v-model="$i18n.locale">
-              <option value="en">en</option>
-              <option value="ja">ja</option>
-            </select>
-          </form>
-          <p>{{ $t('hello') }}</p>
-        <Child />
-      `
-    })
-    const { html } = await mount(App, i18n)
-    expect(html()).toMatchSnapshot('ja')
-    i18n.global.locale = 'en'
-    await nextTick()
-    expect(html()).toMatchSnapshot('en')
-  })
-
   test('composable', async () => {
-    const i18n = createI18n<false>({
-      legacy: false,
+    const i18n = createI18n({
       locale: 'ja',
       fallbackLocale: ['en'],
       messages: {
@@ -816,7 +456,6 @@ describe('slot reactivity', () => {
 
 test('multi instance', async () => {
   const i18n1 = createI18n({
-    legacy: false,
     locale: 'ja',
     messages: {
       en: {
@@ -825,7 +464,6 @@ test('multi instance', async () => {
     }
   })
   const i18n2 = createI18n({
-    legacy: false,
     locale: 'en',
     messages: {
       ja: {
@@ -857,7 +495,6 @@ test('multi instance', async () => {
 
 test('merge useI18n resources to global scope', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'ja',
     messages: {
       en: {
@@ -933,7 +570,6 @@ test('merge useI18n resources to global scope', async () => {
 describe('merge i18n custom blocks to global scope', () => {
   test('composition mode', async () => {
     const i18n = createI18n({
-      legacy: false,
       locale: 'ja',
       messages: {
         en: {
@@ -988,51 +624,6 @@ describe('merge i18n custom blocks to global scope', () => {
       foo: 'ふー！'
     })
   })
-
-  test('legacy mode', async () => {
-    const i18n = createI18n({
-      legacy: true,
-      locale: 'ja',
-      messages: {
-        en: {
-          hi: { hello: 'hello!' }
-        },
-        ja: {
-          hello: 'こんにちは！'
-        }
-      }
-    })
-
-    const App = defineComponent({
-      __i18nGlobal: [
-        {
-          locale: 'en',
-          resource: {
-            hi: { hi: 'hi!' },
-            foo: 'foo!'
-          }
-        },
-        {
-          locale: 'ja',
-          resource: { foo: 'ふー！' }
-        }
-      ],
-      template: `<p>foo</p>`
-    })
-    await mount(App, i18n)
-
-    expect(i18n.global.getLocaleMessage('en')).toEqual({
-      hi: {
-        hi: 'hi!',
-        hello: 'hello!'
-      },
-      foo: 'foo!'
-    })
-    expect(i18n.global.getLocaleMessage('ja')).toEqual({
-      hello: 'こんにちは！',
-      foo: 'ふー！'
-    })
-  })
 })
 
 describe('custom pluralization', () => {
@@ -1040,70 +631,8 @@ describe('custom pluralization', () => {
   // eslint-disable-next-line @typescript-eslint/no-empty-function
   mockWarn.mockImplementation(() => {})
 
-  test('legacy', async () => {
-    const i18n = createI18n({
-      locale: 'ru',
-      pluralizationRules: _pluralRules,
-      messages: {
-        ru: {
-          car: '0 машин | {n} машина | {n} машины | {n} машин'
-        }
-      }
-    })
-
-    const App = defineComponent({
-      template: `
-        <p>{{ $t('car', 1) }}</p>
-        <p>{{ $t('car', 2) }}</p>
-        <p>{{ $t('car', 4) }}</p>
-        <p>{{ $t('car', 12) }}</p>
-        <p>{{ $t('car', 21) }}</p>
-      `
-    })
-    const { find } = await mount(App, i18n)
-    await nextTick()
-    expect(find('p:nth-child(1)')!.innerHTML).toEqual('1 машина')
-    expect(find('p:nth-child(2)')!.innerHTML).toEqual('2 машины')
-    expect(find('p:nth-child(3)')!.innerHTML).toEqual('4 машины')
-    expect(find('p:nth-child(4)')!.innerHTML).toEqual('12 машин')
-    expect(find('p:nth-child(5)')!.innerHTML).toEqual('21 машина')
-  })
-
-  test('legacy + custom block', async () => {
-    const i18n = createI18n({
-      locale: 'ru',
-      pluralizationRules: _pluralRules
-    })
-
-    const App = defineComponent({
-      __i18n: [
-        {
-          locale: 'ru',
-          resource: {
-            car: '0 машин | {n} машина | {n} машины | {n} машин'
-          }
-        }
-      ],
-      template: `
-        <p>{{ $t('car', 1) }}</p>
-        <p>{{ $t('car', 2) }}</p>
-        <p>{{ $t('car', 4) }}</p>
-        <p>{{ $t('car', 12) }}</p>
-        <p>{{ $t('car', 21) }}</p>
-      `
-    })
-    const { find } = await mount(App, i18n)
-    await nextTick()
-    expect(find('p:nth-child(1)')!.innerHTML).toEqual('1 машина')
-    expect(find('p:nth-child(2)')!.innerHTML).toEqual('2 машины')
-    expect(find('p:nth-child(3)')!.innerHTML).toEqual('4 машины')
-    expect(find('p:nth-child(4)')!.innerHTML).toEqual('12 машин')
-    expect(find('p:nth-child(5)')!.innerHTML).toEqual('21 машина')
-  })
-
   test('composition', async () => {
     const i18n = createI18n({
-      legacy: false,
       locale: 'ru',
       pluralRules: _pluralRules,
       messages: {
@@ -1137,7 +666,6 @@ describe('custom pluralization', () => {
 
   test('composition + custom block', async () => {
     const i18n = createI18n({
-      legacy: false,
       locale: 'ru'
     })
 
@@ -1223,7 +751,6 @@ describe('release global scope', () => {
     let error = ''
     try {
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         messages: {}
       })
@@ -1251,9 +778,7 @@ describe('Composer & VueI18n extend hooking', () => {
         return composerDisposeSpy
       })
     const vueI18nExtendSpy = vi.fn()
-    const i18n = createI18n({
-      legacy: false
-    })
+    const i18n = createI18n({})
 
     const GrandChild = defineComponent({
       setup() {
@@ -1311,66 +836,6 @@ describe('Composer & VueI18n extend hooking', () => {
     app.unmount()
     expect(composerDisposeSpy).toHaveBeenCalledTimes(2)
   })
-
-  test('legacy', async () => {
-    const composerExtendSpy = vi.fn()
-    const vueI18nDisposeSpy = vi.fn()
-    let counter = 0
-    const vueI18nExtendSpy = vi.fn().mockImplementation((vueI18n: VueI18n) => {
-      // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      counter += 1
-      ;(vueI18n as any).foo = `foo${counter}`
-      return vueI18nDisposeSpy
-    })
-    const i18n = createI18n({ legacy: true })
-
-    const GrandChild = defineComponent({
-      i18n: {
-        messages: {
-          en: { hello: 'hello, grand child!' }
-        }
-      },
-      template: '<span class="grand-child">{{ $i18n.foo }}</span>'
-    })
-
-    const Child = defineComponent({
-      components: {
-        GrandChild
-      },
-      __i18n: [
-        {
-          locale: '',
-          resource: { en: { hello: 'hello, child!' } }
-        }
-      ] as any,
-      template: '<span class="child">{{ $i18n.foo }}</span><GrandChild />'
-    })
-    const App = defineComponent({
-      components: {
-        Child
-      },
-      template: '<p>{{ $i18n.foo }}</p><Child />'
-    })
-    const { html, app } = await mount(App, i18n, {
-      pluginOptions: {
-        __composerExtend: composerExtendSpy,
-        __vueI18nExtend: vueI18nExtendSpy
-      } as any // eslint-disable-line @typescript-eslint/no-explicit-any
-    })
-
-    // Check that global is not extended
-    expect((i18n.global as any).foo).toBeUndefined() // eslint-disable-line @typescript-eslint/no-explicit-any
-
-    expect(composerExtendSpy).not.toHaveBeenCalled()
-    expect(vueI18nExtendSpy).toHaveBeenCalledTimes(2)
-    expect(html()).toBe(
-      '<p></p><span class="child">foo1</span><span class="grand-child">foo2</span>'
-    )
-
-    // dispose checking
-    app.unmount()
-    expect(vueI18nDisposeSpy).toHaveBeenCalledTimes(2)
-  })
 })
 
 describe('dollar prefixed API (component injections)', () => {
@@ -1395,7 +860,6 @@ describe('dollar prefixed API (component injections)', () => {
 
   test('composition mode', async () => {
     const i18n = createI18n({
-      legacy: false,
       locale: 'en',
       messages
     })
@@ -1428,89 +892,6 @@ describe('dollar prefixed API (component injections)', () => {
       '<div><p>hello world!</p><p>hello, world!</p><p>hello, world!</p><p>no apples</p><p>りんご1個</p><p>default message</p><p>default msg</p><p>4 apples</p><p>default list msg</p><p>こんにちは、世界！</p><p>many apples</p><p>default named msg</p><p>こんにちは、世界！</p><p>hello world!</p><p>こんにちは、世界！</p></div>'
     )
   })
-
-  test('legacy mode', async () => {
-    const i18n = createI18n({
-      legacy: true,
-      locale: 'en',
-      messages
-    })
-    const App = defineComponent({
-      template: `<div>
-<p>{{ $t('hello') }}</p>
-<p>{{ $t('list', ['world']) }}</p>
-<p>{{ $t('named', { name: 'world' }) }}</p>
-<p>{{ $t('plural', 0) }}</p>
-<p>{{ $t('plural', 1, { locale: 'ja' }) }}</p>
-<p>{{ $t('default', 'default message') }}</p>
-<p>{{ $t('default', 'default {msg}', { named: { msg: 'msg' } }) }}</p>
-<p>{{ $t('plural', ['many'], 4) }}</p>
-<p>{{ $t('default', ['list msg'], 'default {0}') }}</p>
-<p>{{ $t('list', ['世界'], { locale: 'ja' }) }}</p>
-<p>{{ $t('plural', { count: 'many' }, 4) }}</p>
-<p>{{ $t('default', { msg: 'named msg' }, 'default {msg}') }}</p>
-<p>{{ $t('named', { name: '世界' }, { locale: 'ja' }) }}</p>
-<p>{{ $t('hello', {}, { locale: 'en' }) }}</p>
-<p>{{ $t('hello', [], { locale: 'ja' }) }}</p>
-</div>`
-    })
-    const wrapper = await mount(App, i18n)
-
-    expect(wrapper.html()).toEqual(
-      '<div><p>hello world!</p><p>hello, world!</p><p>hello, world!</p><p>no apples</p><p>りんご1個</p><p>default message</p><p>default msg</p><p>4 apples</p><p>default list msg</p><p>こんにちは、世界！</p><p>many apples</p><p>default named msg</p><p>こんにちは、世界！</p><p>hello world!</p><p>こんにちは、世界！</p></div>'
-    )
-  })
-})
-
-test('`t` on Legacy API mode', async () => {
-  const messages = {
-    en: {
-      hello: 'hello world!',
-      list: 'hello, {0}!',
-      named: 'hello, {name}!',
-      plural: 'no apples | one apple | {count} apples'
-    },
-    ja: {
-      hello: 'こんにちは、世界！',
-      list: 'こんにちは、{0}！',
-      named: 'こんにちは、{name}！',
-      plural: 'りんご無い | りんご1個 | りんご{count}個'
-    }
-  }
-
-  const i18n = createI18n({
-    legacy: true,
-    locale: 'en',
-    messages
-  })
-
-  expect(i18n.global.t('hello')).toEqual('hello world!')
-  expect(i18n.global.t('list', ['world'])).toEqual('hello, world!')
-  expect(i18n.global.t('named', { name: 'world' })).toEqual('hello, world!')
-  expect(i18n.global.t('plural', 0)).toEqual('no apples')
-  expect(i18n.global.t('plural', 1)).toEqual('one apple')
-  expect(i18n.global.t('default', 'default message')).toEqual('default message')
-  expect(
-    i18n.global.t('default', 'default {msg}', { named: { msg: 'msg' } })
-  ).toEqual('default msg')
-  expect(i18n.global.t('plural', ['many'], 4)).toEqual('4 apples')
-  expect(i18n.global.t('default', ['list msg'], 'default {0}')).toEqual(
-    'default list msg'
-  )
-  expect(i18n.global.t('list', ['世界'], { locale: 'ja' })).toEqual(
-    'こんにちは、世界！'
-  )
-  expect(i18n.global.t('plural', { count: 'many' }, 4)).toEqual('many apples')
-  expect(
-    i18n.global.t('default', { msg: 'named msg' }, 'default {msg}')
-  ).toEqual('default named msg')
-  expect(i18n.global.t('named', { name: '世界' }, { locale: 'ja' })).toEqual(
-    'こんにちは、世界！'
-  )
-  expect(i18n.global.t('hello', {}, { locale: 'en' })).toEqual('hello world!')
-  expect(i18n.global.t('hello', [], { locale: 'ja' })).toEqual(
-    'こんにちは、世界！'
-  )
 })
 
 test('`t` on Composition API mode', async () => {
@@ -1530,7 +911,6 @@ test('`t` on Composition API mode', async () => {
   }
 
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages
   })
diff --git a/packages/vue-i18n-core/test/issues.test.ts b/packages/vue-i18n-core/test/issues.test.ts
index 09c060c87..b08d9349b 100644
--- a/packages/vue-i18n-core/test/issues.test.ts
+++ b/packages/vue-i18n-core/test/issues.test.ts
@@ -131,99 +131,7 @@ const numberFormats: IntlNumberFormats = {
   }
 }
 
-test('issue #708', async () => {
-  const i18n = createI18n({
-    legacy: true,
-    locale: 'en',
-    messages
-  })
-
-  const C2 = defineComponent({
-    template: `<div>C2 slot: <slot></slot></div>`
-  })
-
-  const C1 = defineComponent({
-    components: {
-      C2
-    },
-    template: `<div>
-	C1:
-	<div>{{ $t("hello", { world: $t("world") }) }}</div>
-	<i18n-t keypath="hello" tag="div">
-	  <template #world>
-	    <strong>{{ $t("world") }}</strong>
-	  </template>
-	</i18n-t>
-
-	<br />
-
-	<C2>
-	  <div>{{ $t("hello", { world: $t("world") }) }}</div>
-	  <i18n-t keypath="hello" tag="div">
-	    <template #world>
-	      <strong>{{ $t("world") }}</strong>
-	    </template>
-	  </i18n-t>
-	</C2>
-      </div>`,
-    i18n: {
-      messages: {
-        en: {
-          hello: 'Hello {world}',
-          world: 'world!'
-        }
-      }
-    }
-  })
-
-  const App = defineComponent({
-    components: {
-      C1
-    },
-    template: `<C1 />`
-  })
-  const wrapper = await mount(App, i18n)
-
-  expect(wrapper.html()).toEqual(
-    `<div> C1: <div>Hello world!</div><div>Hello <strong>world!</strong></div><br><div>C2 slot: <div>Hello world!</div><div>Hello <strong>world!</strong></div></div></div>`
-  )
-})
-
 describe('issue #722', () => {
-  test('legacy', async () => {
-    const messages = {
-      en: { language: 'English' },
-      ja: { language: '日本語' }
-    }
-
-    const i18n = createI18n({
-      legacy: true,
-      locale: 'en',
-      messages
-    })
-
-    const App = defineComponent({
-      template: `<transition name="fade">
-	  <i18n-t keypath="hello" tag="p">
-	    <template #world>
-		<b>{{ $t("world") }}</b>
-	    </template>
-	  </i18n-t>
-      </transition>`,
-      i18n: {
-        messages: {
-          en: {
-            hello: 'Hello {world}',
-            world: 'world!'
-          }
-        }
-      }
-    })
-    const wrapper = await mount(App, i18n)
-
-    expect(wrapper.html()).toEqual(`<p>Hello <b>world!</b></p>`)
-  })
-
   test('composition', async () => {
     const messages = {
       en: { language: 'English' },
@@ -231,7 +139,6 @@ describe('issue #722', () => {
     }
 
     const i18n = createI18n({
-      legacy: false,
       locale: 'en',
       messages
     })
@@ -262,43 +169,6 @@ describe('issue #722', () => {
     expect(wrapper.html()).toEqual(`<p>Hello <b>world!</b></p>`)
   })
 
-  test('v-if: legacy', async () => {
-    const messages = {
-      en: { language: 'English' },
-      ja: { language: '日本語' }
-    }
-
-    const i18n = createI18n({
-      legacy: true,
-      locale: 'en',
-      messages
-    })
-
-    const App = defineComponent({
-      data() {
-        return { flag: true }
-      },
-      template: `<div v-if="flag">
-	  <i18n-t keypath="hello" tag="p">
-	    <template #world>
-		<b>{{ $t("world") }}</b>
-	    </template>
-	  </i18n-t>
-      </div>`,
-      i18n: {
-        messages: {
-          en: {
-            hello: 'Hello {world}',
-            world: 'world!'
-          }
-        }
-      }
-    })
-    const wrapper = await mount(App, i18n)
-
-    expect(wrapper.html()).toEqual(`<div><p>Hello <b>world!</b></p></div>`)
-  })
-
   test('v-if: composition', async () => {
     const messages = {
       en: { language: 'English' },
@@ -306,7 +176,6 @@ describe('issue #722', () => {
     }
 
     const i18n = createI18n({
-      legacy: false,
       locale: 'en',
       messages
     })
@@ -347,95 +216,8 @@ describe('issue #722', () => {
   })
 })
 
-test('issue #729', async () => {
-  const i18n = createI18n({
-    legacy: true,
-    locale: 'en',
-    messages
-  })
-
-  const C3 = defineComponent({
-    template: `<div>C3 slot: <slot></slot></div>`,
-    i18n: {
-      messages: {
-        en: {
-          hello: 'Hello {world} - C3',
-          world: 'world! - C3'
-        }
-      }
-    }
-  })
-
-  const C2 = defineComponent({
-    template: `<div>C2 slot: <slot></slot></div>`,
-    i18n: {
-      messages: {
-        en: {
-          goodbuy: 'Goodbuy!'
-        }
-      }
-    }
-  })
-
-  const C1 = defineComponent({
-    components: {
-      C2,
-      C3
-    },
-    template: `<div>
-	C1:
-	<div>{{ $t("hello", { world: $t("world") }) }}</div>
-	<i18n-t keypath="hello" tag="div">
-	  <template #world>
-	    <strong>{{ $t("world") }}</strong>
-	  </template>
-	</i18n-t>
-
-	<br />
-
-	<C2>
-	  <div>{{ $t("hello", { world: $t("world") }) }}</div>
-	  <i18n-t keypath="hello" tag="div">
-	    <template #world>
-	      <strong>{{ $t("world") }}</strong>
-	    </template>
-	  </i18n-t>
-	</C2>
-  <C3>
-    <div>{{ $t("hello", { world: $t("world") }) }}</div>
-    <i18n-t keypath="hello" tag="div">
-      <template #world>
-        <strong>{{ $t("world") }}</strong>
-      </template>
-    </i18n-t>
-  </C3>
-      </div>`,
-    i18n: {
-      messages: {
-        en: {
-          hello: 'Hello {world}',
-          world: 'world!'
-        }
-      }
-    }
-  })
-
-  const App = defineComponent({
-    components: {
-      C1
-    },
-    template: `<C1 />`
-  })
-  const wrapper = await mount(App, i18n)
-
-  expect(wrapper.html()).toEqual(
-    `<div> C1: <div>Hello world!</div><div>Hello <strong>world!</strong></div><br><div>C2 slot: <div>Hello world!</div><div>Hello <strong>world!</strong></div></div><div>C3 slot: <div>Hello world!</div><div>Hello <strong>world!</strong></div></div></div>`
-  )
-})
-
 test('issue #819: v-for', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages
   })
@@ -462,54 +244,12 @@ test('issue #819: v-for', async () => {
 })
 
 describe('issue #853', () => {
-  test('legacy', async () => {
-    const mockWarn = vi.spyOn(shared, 'warn')
-    // eslint-disable-next-line @typescript-eslint/no-empty-function
-    mockWarn.mockImplementation(() => {})
-
-    const i18n = createI18n({
-      locale: 'en',
-      fallbackLocale: 'en',
-      warnHtmlInMessage: 'off',
-      messages: {
-        en: {
-          hello: '<p>hello</p>'
-        }
-      }
-    })
-
-    const Child = defineComponent({
-      i18n: {
-        messages: {
-          en: { child: '<p>child</p>' }
-        }
-      },
-      template: `<div v-html="$t('child')"></div>`
-    })
-
-    const App = defineComponent({
-      components: {
-        Child
-      },
-      template: `
-        <div>
-          <Child />
-          <div v-html="$t('hello')"></div>
-        </div>`
-    })
-
-    await mount(App, i18n)
-
-    expect(mockWarn).toHaveBeenCalledTimes(0)
-  })
-
   test('compostion', async () => {
     const mockWarn = vi.spyOn(shared, 'warn')
     // eslint-disable-next-line @typescript-eslint/no-empty-function
     mockWarn.mockImplementation(() => {})
 
     const i18n = createI18n({
-      legacy: false,
       locale: 'en',
       fallbackLocale: 'en',
       warnHtmlMessage: false,
@@ -555,7 +295,6 @@ test('issue #854', async () => {
   mockWarn.mockImplementation(() => {})
 
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     fallbackLocale: 'en',
     messages: {
@@ -591,7 +330,6 @@ test('issue #854', async () => {
 
 test('issue #933', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     fallbackLocale: 'en',
     messages: {
@@ -622,7 +360,6 @@ test('issue #933', async () => {
 
 test('issue #964', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'ja',
     fallbackLocale: 'en',
     messages: {
@@ -692,7 +429,6 @@ test('issue #968', async () => {
 
 test('issue #1014', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages: {
       en: {
@@ -715,7 +451,6 @@ test('issue #1014', async () => {
 
 test('issue #1054, #1053', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en-US',
     datetimeFormats: {}
   })
@@ -743,7 +478,6 @@ test('issue #1054, #1053', async () => {
 
 test('issue #1083', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages: {
       en: {
@@ -796,7 +530,6 @@ test('issue #1083', async () => {
 
 test('issue #1123', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages
   })
@@ -827,7 +560,6 @@ test('issue #1123', async () => {
 
 test('issue #1365', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     flatJson: true,
     messages: {
@@ -874,7 +606,6 @@ test('issue #1373', async () => {
 
 test('issue #1392', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages: {
       en: { hello: 'world' }
@@ -942,7 +673,6 @@ test('issue #1392', async () => {
 
 test('issue #1538', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     fallbackLocale: 'en',
     messages: {
@@ -970,7 +700,6 @@ test('issue #1538', async () => {
 
 test('issue #1547', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     fallbackLocale: 'en',
     messages: {
@@ -1005,7 +734,6 @@ test('issue #1547', async () => {
 
 test('issue #1559', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages: {
       en: {
@@ -1037,7 +765,6 @@ test('issue #1559', async () => {
 
 test('issue #1595', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     flatJson: true,
     messages: {
@@ -1094,7 +821,6 @@ test('issue #1595', async () => {
 
 test('issue #1595 merge case', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     flatJson: true,
     messages: {
@@ -1157,7 +883,6 @@ test('issue #1610', async () => {
     language: 'Languages'
   }
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     globalInjection: true,
     messages: {
@@ -1201,7 +926,6 @@ test('issue #1615', async () => {
     })()
   }
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     globalInjection: true,
     messages: {
@@ -1336,7 +1060,6 @@ test('#1809', async () => {
 
 test('#1912', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages: {
       en: {
@@ -1383,7 +1106,6 @@ test('#1912', async () => {
 
 test('#1972', () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages: {
       en: {
@@ -1424,7 +1146,6 @@ describe('CVE-2024-52809', () => {
       }
     }
     const i18n = createI18n({
-      legacy: false,
       locale: 'en',
       messages: {
         en
@@ -1452,7 +1173,6 @@ describe('CVE-2024-52809', () => {
       }
     }
     const i18n = createI18n({
-      legacy: false,
       locale: 'en',
       messages: {
         en
diff --git a/packages/vue-i18n-core/test/mixin.test.ts b/packages/vue-i18n-core/test/mixin.test.ts
deleted file mode 100644
index d7cc1443a..000000000
--- a/packages/vue-i18n-core/test/mixin.test.ts
+++ /dev/null
@@ -1,264 +0,0 @@
-/**
- * @vitest-environment jsdom
- */
-
-// utils
-vi.mock('@intlify/shared', async () => {
-  const actual = await vi.importActual<object>('@intlify/shared')
-  return {
-    ...actual,
-    warnOnce: vi.fn()
-  }
-})
-
-import {
-  compile,
-  fallbackWithLocaleChain,
-  registerLocaleFallbacker,
-  registerMessageCompiler,
-  registerMessageResolver,
-  resolveValue
-} from '@intlify/core-base'
-import { defineComponent, nextTick } from 'vue'
-import { errorMessages, I18nErrorCodes } from '../src/errors'
-import { createI18n } from '../src/index'
-import { mount } from './helper'
-
-import type { VueI18n } from '../src/legacy'
-
-beforeAll(() => {
-  registerMessageCompiler(compile)
-  registerMessageResolver(resolveValue)
-  registerLocaleFallbacker(fallbackWithLocaleChain)
-})
-
-describe('beforeCreate', () => {
-  test('i18n option', async () => {
-    const i18n = createI18n({
-      legacy: true,
-      locale: 'en',
-      messages: {
-        en: {
-          hello: 'hello!'
-        }
-      }
-    })
-
-    const App = defineComponent({
-      template: `<p>{{ $t('bye') }}</p>`,
-      i18n: {
-        locale: 'ja',
-        sync: false,
-        messages: {
-          ja: {
-            bye: 'さようなら'
-          }
-        }
-      }
-    })
-    const { html } = await mount(App, i18n)
-
-    expect(html()).toEqual('<p>さようなら</p>')
-  })
-
-  test('__i18n option', async () => {
-    const i18n = createI18n({
-      legacy: true,
-      locale: 'en',
-      messages: {
-        en: {
-          hello: 'hello!'
-        }
-      }
-    })
-
-    const messages = {
-      en: {
-        bye: 'good bye!'
-      }
-    }
-    const App = defineComponent({
-      template: `<p>{{ $t('bye') }}</p>`,
-      __i18n: [
-        {
-          locale: '',
-          resource: messages as any // eslint-disable-line @typescript-eslint/no-explicit-any
-        }
-      ]
-    })
-    const { html } = await mount(App, i18n)
-
-    expect(html()).toEqual('<p>good bye!</p>')
-  })
-})
-
-test('$t', async () => {
-  const i18n = createI18n({
-    legacy: true,
-    locale: 'en',
-    messages: {
-      en: {
-        hello: 'hello!'
-      }
-    }
-  })
-
-  const App = defineComponent({ template: '<br/>' })
-  const { vm } = await mount(App, i18n)
-
-  expect(vm.$t!('hello')).toEqual('hello!')
-})
-
-test('$rt', async () => {
-  const i18n = createI18n({
-    legacy: true,
-    locale: 'en',
-    messages: {
-      en: {
-        contents: [
-          {
-            title: 'Title {0}'
-          },
-          {
-            title: () => 'Title 2'
-          }
-        ]
-      }
-    }
-  })
-
-  const App = defineComponent({
-    template: `<p v-for="(content, index) in $tm('contents')">{{ $rt(content.title, [index + 1]) }}</p>`
-  })
-  const { html } = await mount(App, i18n)
-
-  expect(html()).toEqual('<p>Title 1</p><p>Title 2</p>')
-})
-
-test('$te', async () => {
-  const i18n = createI18n({
-    legacy: true,
-    locale: 'en',
-    messages: {
-      en: {
-        hello: 'hello!'
-      }
-    }
-  })
-
-  const App = defineComponent({ template: '<br/>' })
-  const { vm } = await mount(App, i18n)
-
-  expect(vm.$te!('hello')).toBe(true)
-  expect(vm.$te!('foo')).toBe(false)
-})
-
-test('$d', async () => {
-  const i18n = createI18n({
-    legacy: true,
-    locale: 'en-US',
-    datetimeFormats: {
-      'en-US': {
-        short: {
-          year: 'numeric',
-          month: '2-digit',
-          day: '2-digit',
-          hour: '2-digit',
-          minute: '2-digit',
-          timeZone: 'America/New_York'
-        }
-      }
-    }
-  })
-
-  const App = defineComponent({ template: '<br/>' })
-  const { vm } = await mount(App, i18n)
-
-  const dt = new Date(Date.UTC(2012, 11, 20, 3, 0, 0))
-  expect(vm.$d!(dt, 'short')).toEqual('12/19/2012, 10:00 PM')
-})
-
-test('$n', async () => {
-  const i18n = createI18n({
-    legacy: true,
-    locale: 'en-US',
-    numberFormats: {
-      'en-US': {
-        percent: {
-          style: 'percent',
-          useGrouping: false
-        }
-      }
-    }
-  })
-
-  const App = defineComponent({ template: '<br/>' })
-  const { vm } = await mount(App, i18n)
-
-  expect(vm.$n!(0.99, 'percent')).toEqual('99%')
-})
-
-test('$i18n', async () => {
-  const i18n = createI18n({
-    legacy: true,
-    locale: 'en',
-    messages: {
-      en: {
-        hello: 'hello!'
-      }
-    }
-  })
-
-  const App = defineComponent({ template: '<br/>' })
-  const { vm } = await mount(App, i18n)
-
-  expect((vm.$i18n! as VueI18n).t('hello')).toEqual('hello!')
-})
-
-test.skip('beforeDestroy', async () => {
-  const i18n = createI18n({
-    legacy: true,
-    locale: 'en',
-    messages: {
-      en: {
-        hello: 'hello!'
-      }
-    }
-  })
-
-  const App = defineComponent({ template: '<br/>' })
-  const { app, vm } = await mount(App, i18n)
-
-  app.unmount()
-  await nextTick()
-
-  expect(vm.$i18n).toBeUndefined()
-})
-
-describe.skip('errors', () => {
-  test(errorMessages[I18nErrorCodes.UNEXPECTED_ERROR], async () => {
-    const i18n = createI18n({
-      legacy: true,
-      locale: 'en',
-      messages: {
-        en: {
-          hello: 'hello!'
-        }
-      }
-    })
-
-    const App = defineComponent({
-      template: '<p>foo</p>'
-    })
-
-    let error: Error | null = null
-    try {
-      await mount(App, i18n)
-    } catch (e) {
-      error = e as Error
-    }
-    expect(error!.message).toEqual(
-      errorMessages[I18nErrorCodes.UNEXPECTED_ERROR]
-    )
-  })
-})
diff --git a/packages/vue-i18n-core/test/wc.test.ts b/packages/vue-i18n-core/test/wc.test.ts
index 187d668dd..94ef0933c 100644
--- a/packages/vue-i18n-core/test/wc.test.ts
+++ b/packages/vue-i18n-core/test/wc.test.ts
@@ -36,8 +36,7 @@ beforeEach(() => {
 })
 
 test('basic', async () => {
-  const i18n = createI18n<false>({
-    legacy: false,
+  const i18n = createI18n({
     locale: 'en',
     messages: {
       en: {
@@ -83,8 +82,7 @@ test('basic', async () => {
 })
 
 test('custom blocks', async () => {
-  const i18n = createI18n<false>({
-    legacy: false,
+  const i18n = createI18n({
     locale: 'en',
     messages: {
       en: {

From 1a55f2a65a5155e00baa808e72e4977c0aa826c0 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 17:45:55 +0900
Subject: [PATCH 03/18] update config

---
 packages/global.d.ts | 1 -
 rollup.config.mjs    | 3 ---
 scripts/rolldown.ts  | 3 ---
 vitest.config.ts     | 1 -
 4 files changed, 8 deletions(-)

diff --git a/packages/global.d.ts b/packages/global.d.ts
index 441f998ec..f9d912336 100644
--- a/packages/global.d.ts
+++ b/packages/global.d.ts
@@ -15,6 +15,5 @@ declare let __COMMIT__: string
 // Feature flags
 declare let __FEATURE_PROD_VUE_DEVTOOLS__: boolean
 declare let __FEATURE_PROD_INTLIFY_DEVTOOLS__: boolean
-declare let __FEATURE_LEGACY_API__: boolean
 declare let __FEATURE_FULL_INSTALL__: boolean
 declare let __FEATURE_DROP_MESSAGE_COMPILER__: boolean
diff --git a/rollup.config.mjs b/rollup.config.mjs
index d017270bb..8b3be9ce9 100644
--- a/rollup.config.mjs
+++ b/rollup.config.mjs
@@ -354,9 +354,6 @@ function createReplacePlugin(
     __FEATURE_FULL_INSTALL__: isBundlerESMBuild
       ? `__VUE_I18N_FULL_INSTALL__`
       : `true`,
-    __FEATURE_LEGACY_API__: isBundlerESMBuild
-      ? `__VUE_I18N_LEGACY_API__`
-      : `true`,
     __FEATURE_PROD_VUE_DEVTOOLS__:
       ['vue-i18n', 'petite-vue-i18n'].includes(name) && isNodeBuild
         ? 'false' // tree-shake devtools
diff --git a/scripts/rolldown.ts b/scripts/rolldown.ts
index 456070030..ceb700c64 100644
--- a/scripts/rolldown.ts
+++ b/scripts/rolldown.ts
@@ -238,9 +238,6 @@ export function createConfigsForPackage({
         __FEATURE_FULL_INSTALL__: isBundlerESMBuild
           ? `__VUE_I18N_FULL_INSTALL__`
           : `true`,
-        __FEATURE_LEGACY_API__: isBundlerESMBuild
-          ? `__VUE_I18N_LEGACY_API__`
-          : `true`,
         __FEATURE_PROD_VUE_DEVTOOLS__:
           ['vue-i18n', 'petite-vue-i18n'].includes(name) && isNodeBuild
             ? 'false' // tree-shake devtools
diff --git a/vitest.config.ts b/vitest.config.ts
index befffed76..83ea2d92e 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -18,7 +18,6 @@ export default defineConfig({
     __NODE_JS__: true,
     __LITE__: false,
     __FEATURE_FULL_INSTALL__: true,
-    __FEATURE_LEGACY_API__: true,
     __FEATURE_DROP_MESSAGE_COMPILER__: false
   },
   resolve: {

From 1f743b9af825e9d0b6fb9ebac73b397fa04aa09b Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 17:49:23 +0900
Subject: [PATCH 04/18] fix e2e

---
 e2e/fallback/basic.spec.ts       | 2 +-
 e2e/fallback/component.spec.ts   | 2 +-
 e2e/fallback/format.spec.ts      | 2 +-
 e2e/fallback/suppress.spec.ts    | 2 +-
 e2e/formatting/linked.spec.ts    | 2 +-
 e2e/formatting/list.spec.ts      | 2 +-
 e2e/formatting/literal.spec.ts   | 2 +-
 e2e/formatting/named.spec.ts     | 2 +-
 e2e/functions/linked.spec.ts     | 2 +-
 e2e/functions/list.spec.ts       | 2 +-
 e2e/functions/named.spec.ts      | 2 +-
 e2e/functions/plural.spec.ts     | 2 +-
 e2e/missing/handler.spec.ts      | 2 +-
 e2e/missing/suppress.spec.ts     | 2 +-
 e2e/plural/basic.spec.ts         | 2 +-
 e2e/plural/custom.spec.ts        | 2 +-
 e2e/scope/global.spec.ts         | 2 +-
 e2e/scope/inherit-locale.spec.ts | 2 +-
 e2e/scope/local.spec.ts          | 2 +-
 e2e/started.spec.ts              | 2 +-
 20 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/e2e/fallback/basic.spec.ts b/e2e/fallback/basic.spec.ts
index 36f9d6a3f..49757631c 100644
--- a/e2e/fallback/basic.spec.ts
+++ b/e2e/fallback/basic.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     const warnings: string[] = []
     beforeAll(async () => {
diff --git a/e2e/fallback/component.spec.ts b/e2e/fallback/component.spec.ts
index 5f283599b..e0f9c4641 100644
--- a/e2e/fallback/component.spec.ts
+++ b/e2e/fallback/component.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/fallback/component.html`))
diff --git a/e2e/fallback/format.spec.ts b/e2e/fallback/format.spec.ts
index 0ed626b25..40e18f49b 100644
--- a/e2e/fallback/format.spec.ts
+++ b/e2e/fallback/format.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     const warnings: string[] = []
     beforeAll(async () => {
diff --git a/e2e/fallback/suppress.spec.ts b/e2e/fallback/suppress.spec.ts
index 967aa1e41..11b2482e9 100644
--- a/e2e/fallback/suppress.spec.ts
+++ b/e2e/fallback/suppress.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     const warnings: string[] = []
     beforeAll(async () => {
diff --git a/e2e/formatting/linked.spec.ts b/e2e/formatting/linked.spec.ts
index 19080d419..6dea82e04 100644
--- a/e2e/formatting/linked.spec.ts
+++ b/e2e/formatting/linked.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/formatting/linked.html`))
diff --git a/e2e/formatting/list.spec.ts b/e2e/formatting/list.spec.ts
index 4a6e6f69a..8e23f6a04 100644
--- a/e2e/formatting/list.spec.ts
+++ b/e2e/formatting/list.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/formatting/list.html`))
diff --git a/e2e/formatting/literal.spec.ts b/e2e/formatting/literal.spec.ts
index 2f4cd7fad..ee483ac9a 100644
--- a/e2e/formatting/literal.spec.ts
+++ b/e2e/formatting/literal.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/formatting/literal.html`))
diff --git a/e2e/formatting/named.spec.ts b/e2e/formatting/named.spec.ts
index 8d11e1e14..549d9634f 100644
--- a/e2e/formatting/named.spec.ts
+++ b/e2e/formatting/named.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/formatting/named.html`))
diff --git a/e2e/functions/linked.spec.ts b/e2e/functions/linked.spec.ts
index e8d35ec1e..29ee3a9c0 100644
--- a/e2e/functions/linked.spec.ts
+++ b/e2e/functions/linked.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/functions/linked.html`))
diff --git a/e2e/functions/list.spec.ts b/e2e/functions/list.spec.ts
index 5b20308a7..c4483af3e 100644
--- a/e2e/functions/list.spec.ts
+++ b/e2e/functions/list.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/functions/list.html`))
diff --git a/e2e/functions/named.spec.ts b/e2e/functions/named.spec.ts
index 3b769034f..f6cbb53a2 100644
--- a/e2e/functions/named.spec.ts
+++ b/e2e/functions/named.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/functions/named.html`))
diff --git a/e2e/functions/plural.spec.ts b/e2e/functions/plural.spec.ts
index 28038ee40..f0edd9b5f 100644
--- a/e2e/functions/plural.spec.ts
+++ b/e2e/functions/plural.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/functions/plural.html`))
diff --git a/e2e/missing/handler.spec.ts b/e2e/missing/handler.spec.ts
index 304246857..579b961b9 100644
--- a/e2e/missing/handler.spec.ts
+++ b/e2e/missing/handler.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     const warnings: string[] = []
     beforeAll(async () => {
diff --git a/e2e/missing/suppress.spec.ts b/e2e/missing/suppress.spec.ts
index 78b7a6afc..d3201c499 100644
--- a/e2e/missing/suppress.spec.ts
+++ b/e2e/missing/suppress.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     const warnings: string[] = []
     beforeAll(async () => {
diff --git a/e2e/plural/basic.spec.ts b/e2e/plural/basic.spec.ts
index 18b41328c..2476890ac 100644
--- a/e2e/plural/basic.spec.ts
+++ b/e2e/plural/basic.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/plural/basic.html`))
diff --git a/e2e/plural/custom.spec.ts b/e2e/plural/custom.spec.ts
index d0f6f2a24..9c8c2d091 100644
--- a/e2e/plural/custom.spec.ts
+++ b/e2e/plural/custom.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/plural/custom.html`))
diff --git a/e2e/scope/global.spec.ts b/e2e/scope/global.spec.ts
index 4e34bea2c..cfa4b9d0d 100644
--- a/e2e/scope/global.spec.ts
+++ b/e2e/scope/global.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/scope/global.html`))
diff --git a/e2e/scope/inherit-locale.spec.ts b/e2e/scope/inherit-locale.spec.ts
index 39cd72b02..9173d1362 100644
--- a/e2e/scope/inherit-locale.spec.ts
+++ b/e2e/scope/inherit-locale.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/scope/inherit-locale.html`))
diff --git a/e2e/scope/local.spec.ts b/e2e/scope/local.spec.ts
index 7970df665..7b190c717 100644
--- a/e2e/scope/local.spec.ts
+++ b/e2e/scope/local.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/scope/local.html`))
diff --git a/e2e/started.spec.ts b/e2e/started.spec.ts
index bad7b5885..42a42eb6a 100644
--- a/e2e/started.spec.ts
+++ b/e2e/started.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from './helper'
-;['composition', 'petite', 'legacy'].forEach(pattern => {
+;['composition', 'petite'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/started.html`))

From f8e6352ba832d6fc80bfeee60f236582972329e7 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 17:53:02 +0900
Subject: [PATCH 05/18] fix e2e

---
 e2e/components/datetime-format.spec.ts | 2 +-
 e2e/components/number-format.spec.ts   | 2 +-
 e2e/components/translation.spec.ts     | 2 +-
 e2e/datetime.spec.ts                   | 2 +-
 e2e/number.spec.ts                     | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/e2e/components/datetime-format.spec.ts b/e2e/components/datetime-format.spec.ts
index f1a5af82c..fa75acc53 100644
--- a/e2e/components/datetime-format.spec.ts
+++ b/e2e/components/datetime-format.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'legacy'].forEach(pattern => {
+;['composition'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(
diff --git a/e2e/components/number-format.spec.ts b/e2e/components/number-format.spec.ts
index 60eeeedb5..a9b299c9c 100644
--- a/e2e/components/number-format.spec.ts
+++ b/e2e/components/number-format.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'legacy'].forEach(pattern => {
+;['composition'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/components/number-format.html`))
diff --git a/e2e/components/translation.spec.ts b/e2e/components/translation.spec.ts
index 26a261b42..a2287bd7a 100644
--- a/e2e/components/translation.spec.ts
+++ b/e2e/components/translation.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from '../helper'
-;['composition', 'legacy'].forEach(pattern => {
+;['composition'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/components/translation.html`))
diff --git a/e2e/datetime.spec.ts b/e2e/datetime.spec.ts
index 30e6e59fa..1785b256d 100644
--- a/e2e/datetime.spec.ts
+++ b/e2e/datetime.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from './helper'
-;['composition', 'legacy'].forEach(pattern => {
+;['composition'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/datetime.html`))
diff --git a/e2e/number.spec.ts b/e2e/number.spec.ts
index d33c1a39c..cbbc93eb8 100644
--- a/e2e/number.spec.ts
+++ b/e2e/number.spec.ts
@@ -1,5 +1,5 @@
 import { getText, url } from './helper'
-;['composition', 'legacy'].forEach(pattern => {
+;['composition'].forEach(pattern => {
   describe(`${pattern}`, () => {
     beforeAll(async () => {
       await page.goto(url(`/examples/${pattern}/number.html`))

From 9fe87e097bcdc25aa7393ff552ed3dc181cd99b9 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 18:08:10 +0900
Subject: [PATCH 06/18] fix exports

---
 packages/petite-vue-i18n/src/index.ts        |   17 -
 packages/petite-vue-i18n/src/runtime.ts      |   16 +-
 packages/vue-i18n-core/src/index.ts          |   23 +-
 packages/vue-i18n-core/src/legacy.ts         | 1675 ------------------
 packages/vue-i18n-core/src/petite.ts         |   16 -
 packages/vue-i18n-core/src/types.ts          |   19 +-
 packages/vue-i18n-core/test/legacy.test-d.ts |  231 ---
 packages/vue-i18n-core/test/legacy.test.ts   |  592 -------
 packages/vue-i18n/src/index.ts               |   16 +-
 packages/vue-i18n/src/runtime.ts             |   16 +-
 10 files changed, 5 insertions(+), 2616 deletions(-)
 delete mode 100644 packages/vue-i18n-core/src/legacy.ts
 delete mode 100644 packages/vue-i18n-core/test/legacy.test-d.ts
 delete mode 100644 packages/vue-i18n-core/test/legacy.test.ts

diff --git a/packages/petite-vue-i18n/src/index.ts b/packages/petite-vue-i18n/src/index.ts
index da9cb0a51..3ede50164 100644
--- a/packages/petite-vue-i18n/src/index.ts
+++ b/packages/petite-vue-i18n/src/index.ts
@@ -78,23 +78,6 @@ export type {
   VueMessageType
 } from '@intlify/vue-i18n-core/petite'
 
-export type {
-  Choice,
-  DateTimeFormatResult,
-  LocaleMessageObject,
-  NumberFormatResult,
-  PluralizationRulesMap,
-  TranslateResult,
-  VueI18n,
-  VueI18nDateTimeFormatting,
-  VueI18nExtender,
-  VueI18nNumberFormatting,
-  VueI18nOptions,
-  VueI18nResolveLocaleMessageTranslation,
-  VueI18nTranslation,
-  WarnHtmlInMessageLevel
-} from '@intlify/vue-i18n-core/petite'
-
 export type {
   IsEmptyObject,
   IsNever,
diff --git a/packages/petite-vue-i18n/src/runtime.ts b/packages/petite-vue-i18n/src/runtime.ts
index 6de23ca7e..058c6557e 100644
--- a/packages/petite-vue-i18n/src/runtime.ts
+++ b/packages/petite-vue-i18n/src/runtime.ts
@@ -48,7 +48,6 @@ export type {
 } from '@intlify/core-base'
 export { createI18n, useI18n, VERSION } from '@intlify/vue-i18n-core/petite'
 export type {
-  Choice,
   Composer,
   ComposerAdditionalOptions,
   ComposerCustom,
@@ -60,7 +59,6 @@ export type {
   ComposerTranslation,
   CustomBlock,
   CustomBlocks,
-  DateTimeFormatResult,
   DefaultDateTimeFormatSchema,
   DefaultLocaleMessageSchema,
   DefaultNumberFormatSchema,
@@ -74,21 +72,9 @@ export type {
   I18nOptions,
   I18nPluginOptions,
   I18nScope,
-  LocaleMessageObject,
   MissingHandler,
-  NumberFormatResult,
-  PluralizationRulesMap,
-  TranslateResult,
   UseI18nOptions,
-  VueI18n,
-  VueI18nDateTimeFormatting,
-  VueI18nExtender,
-  VueI18nNumberFormatting,
-  VueI18nOptions,
-  VueI18nResolveLocaleMessageTranslation,
-  VueI18nTranslation,
-  VueMessageType,
-  WarnHtmlInMessageLevel
+  VueMessageType
 } from '@intlify/vue-i18n-core/petite'
 
 export type {
diff --git a/packages/vue-i18n-core/src/index.ts b/packages/vue-i18n-core/src/index.ts
index ab87baa54..18f9e3330 100644
--- a/packages/vue-i18n-core/src/index.ts
+++ b/packages/vue-i18n-core/src/index.ts
@@ -80,30 +80,9 @@ export type {
   I18nScope,
   UseI18nOptions
 } from './i18n'
-export type {
-  Choice,
-  DateTimeFormatResult,
-  LocaleMessageObject,
-  NumberFormatResult,
-  PluralizationRulesMap,
-  TranslateResult,
-  VueI18n,
-  VueI18nDateTimeFormatting,
-  VueI18nExtender,
-  VueI18nNumberFormatting,
-  VueI18nOptions,
-  VueI18nResolveLocaleMessageTranslation,
-  VueI18nTranslation,
-  WarnHtmlInMessageLevel
-} from './legacy'
 export { initDev, initFeatureFlags, VERSION } from './misc'
 export type { I18nPluginOptions } from './plugin'
-export type {
-  Disposer,
-  GeneratedInstanceType,
-  GeneratedTypeConfig,
-  VueI18nInstance
-} from './types'
+export type { Disposer, GeneratedTypeConfig, VueI18nInstance } from './types'
 
 export type {
   IsEmptyObject,
diff --git a/packages/vue-i18n-core/src/legacy.ts b/packages/vue-i18n-core/src/legacy.ts
deleted file mode 100644
index 55a1fe408..000000000
--- a/packages/vue-i18n-core/src/legacy.ts
+++ /dev/null
@@ -1,1675 +0,0 @@
-/* eslint-disable @typescript-eslint/no-explicit-any */
-import { DEFAULT_LOCALE } from '@intlify/core-base'
-import {
-  assign,
-  isArray,
-  isBoolean,
-  isFunction,
-  isPlainObject,
-  isRegExp,
-  isString
-} from '@intlify/shared'
-import { createComposer } from './composer'
-import { DisableEmitter, EnableEmitter } from './symbols'
-
-import type {
-  DateTimeFormat,
-  DateTimeFormats as DateTimeFormatsType,
-  FallbackLocale,
-  FallbackLocales,
-  GeneratedLocale,
-  IsEmptyObject,
-  IsNever,
-  LinkedModifiers,
-  Locale,
-  LocaleMessage,
-  LocaleMessageDictionary,
-  LocaleMessages,
-  LocaleMessageValue,
-  LocaleParams,
-  MessageResolver,
-  NamedValue,
-  NumberFormat,
-  NumberFormats as NumberFormatsType,
-  Path,
-  PickupFormatKeys,
-  PickupFormatPathKeys,
-  PickupKeys,
-  PickupLocales,
-  PickupPaths,
-  PluralizationRule,
-  PluralizationRules,
-  PostTranslationHandler,
-  RemovedIndexResources,
-  RemoveIndexSignature,
-  SchemaParams,
-  TranslateOptions
-} from '@intlify/core-base'
-import type { VueDevToolsEmitter } from '@intlify/devtools-types'
-import type {
-  Composer,
-  ComposerInternalOptions,
-  ComposerOptions,
-  ComposerResolveLocaleMessageTranslation,
-  DefaultDateTimeFormatSchema,
-  DefaultLocaleMessageSchema,
-  DefaultNumberFormatSchema,
-  DefineDateTimeFormat,
-  DefineLocaleMessage,
-  DefineNumberFormat,
-  MissingHandler,
-  VueMessageType
-} from './composer'
-import type { Disposer } from './types'
-
-/**
- * @deprecated will be removed at vue-i18n v12
- * @VueI18nLegacy
- */
-export type TranslateResult = string
-/**
- * @deprecated will be removed at vue-i18n v12
- * @VueI18nLegacy
- */
-export type Choice = number
-/**
- * @deprecated will be removed at vue-i18n v12
- * @VueI18nLegacy
- */
-export type LocaleMessageObject<Message = string> =
-  LocaleMessageDictionary<Message>
-/**
- * @deprecated will be removed at vue-i18n v12
- * @VueI18nLegacy
- */
-export type PluralizationRulesMap = { [locale: string]: PluralizationRule }
-/**
- * @deprecated will be removed at vue-i18n v12
- * @VueI18nLegacy
- */
-export type WarnHtmlInMessageLevel = 'off' | 'warn' | 'error'
-/**
- * @deprecated will be removed at vue-i18n v12
- * @VueI18nLegacy
- */
-export type DateTimeFormatResult = string
-/**
- * @deprecated will be removed at vue-i18n v12
- * @VueI18nLegacy
- */
-export type NumberFormatResult = string
-/**
- * @deprecated will be removed at vue-i18n v12
- */
-export type VueI18nExtender = (vueI18n: VueI18n) => Disposer | undefined
-
-/**
- *  VueI18n Options
- *
- *  @remarks
- *  This option is compatible with `VueI18n` class constructor options (offered with Vue I18n v8.x)
- *
- * @deprecated will be removed at vue-i18n v12
- *
- *  @VueI18nLegacy
- */
-export interface VueI18nOptions<
-  Schema extends {
-    message?: unknown
-    datetime?: unknown
-    number?: unknown
-  } = {
-    message: DefaultLocaleMessageSchema
-    datetime: DefaultDateTimeFormatSchema
-    number: DefaultNumberFormatSchema
-  },
-  Locales extends
-    | {
-        messages: unknown
-        datetimeFormats: unknown
-        numberFormats: unknown
-      }
-    | string = Locale,
-  Options extends ComposerOptions<Schema, Locales> = ComposerOptions<
-    Schema,
-    Locales
-  >
-> {
-  /**
-   * @remarks
-   * The locale of localization.
-   *
-   * If the locale contains a territory and a dialect, this locale contains an implicit fallback.
-   *
-   * @VueI18nSee [Scope and Locale Changing](../../guide/essentials/scope)
-   *
-   * @defaultValue `'en-US'`
-   */
-  locale?: Options['locale']
-  /**
-   * @remarks
-   * The locale of fallback localization.
-   *
-   * For more complex fallback definitions see fallback.
-   *
-   * @VueI18nSee [Fallbacking](../../guide/essentials/fallback)
-   *
-   * @defaultValue The default `'en-US'` for the `locale` if it's not specified, or it's `locale` value
-   */
-  fallbackLocale?: Options['fallbackLocale']
-  /**
-   * @remarks
-   * The locale messages of localization.
-   *
-   * @VueI18nSee [Getting Started](../../guide/essentials/started)
-   *
-   * @defaultValue `{}`
-   */
-  messages?: Options['messages']
-  /**
-   * @remarks
-   * Allow use flat json messages or not
-   *
-   * @defaultValue `false`
-   */
-  flatJson?: Options['flatJson']
-  /**
-   * @remarks
-   * The datetime formats of localization.
-   *
-   * @VueI18nSee [Datetime Formatting](../../guide/essentials/datetime)
-   *
-   * @defaultValue `{}`
-   */
-  datetimeFormats?: Options['datetimeFormats']
-  /**
-   * @remarks
-   * The number formats of localization.
-   *
-   * @VueI18nSee [Number Formatting](../../guide/essentials/number)
-   *
-   * @defaultValue `{}`
-   */
-  numberFormats?: Options['numberFormats']
-  /**
-   * @remarks
-   * The list of available locales in messages in lexical order.
-   *
-   * @defaultValue `[]`
-   */
-  availableLocales?: Locale[]
-  /**
-   * @remarks
-   * Custom Modifiers for linked messages.
-   *
-   * @VueI18nSee [Custom Modifiers](../../guide/essentials/syntax#custom-modifiers)
-   */
-  modifiers?: Options['modifiers']
-  /**
-   * @remarks
-   * A handler for localization missing.
-   *
-   * The handler gets called with the localization target locale, localization path key, the Vue instance and values.
-   *
-   * If missing handler is assigned, and occurred localization missing, it's not warned.
-   *
-   * @defaultValue `null`
-   */
-  missing?: Options['missing']
-  /**
-   * @remarks
-   * In the component localization, whether to fall back to root level (global scope) localization when localization fails.
-   *
-   * If `false`, it's not fallback to root.
-   *
-   * @VueI18nSee [Fallbacking](../../guide/essentials/fallback)
-   *
-   * @defaultValue `true`
-   */
-  fallbackRoot?: Options['fallbackRoot']
-  /**
-   * @remarks
-   * Whether suppress warnings outputted when localization fails.
-   *
-   * If `true`, suppress localization fail warnings.
-   *
-   * If you use regular expression, you can suppress localization fail warnings that it match with translation key (e.g. `t`).
-   *
-   * @VueI18nSee [Fallbacking](../../guide/essentials/fallback)
-   *
-   * @defaultValue `false`
-   */
-  silentTranslationWarn?: Options['missingWarn']
-  /**
-   * @remarks
-   * Whether do template interpolation on translation keys when your language lacks a translation for a key.
-   *
-   * If `true`, skip writing templates for your "base" language; the keys are your templates.
-   *
-   * @VueI18nSee [Fallbacking](../../guide/essentials/fallback)
-   *
-   * @defaultValue `false`
-   */
-  silentFallbackWarn?: Options['fallbackWarn']
-  /**
-   * @remarks
-   * Whether suppress warnings when falling back to either `fallbackLocale` or root.
-   *
-   * @VueI18nSee [Fallbacking](../../guide/essentials/fallback)
-   *
-   * @defaultValue `false`
-   */
-  formatFallbackMessages?: Options['fallbackFormat']
-  /**
-   * @remarks
-   * Whether to allow the use locale messages of HTML formatting.
-   *
-   * See the warnHtmlInMessage property.
-   *
-   * @VueI18nSee [HTML Message](../../guide/essentials/syntax#html-message)
-   * @VueI18nSee [Change `warnHtmlInMessage` option default value](../../guide/migration/breaking#change-warnhtmlinmessage-option-default-value)
-   *
-   * @defaultValue `'off'`
-   */
-  warnHtmlInMessage?: WarnHtmlInMessageLevel
-  /**
-   * @remarks
-   * If `escapeParameterHtml` is configured as true then interpolation parameters are escaped before the message is translated.
-   *
-   * This is useful when translation output is used in `v-html` and the translation resource contains html markup (e.g. <b> around a user provided value).
-   *
-   * This usage pattern mostly occurs when passing precomputed text strings into UI components.
-   *
-   * The escape process involves replacing the following symbols with their respective HTML character entities: `<`, `>`, `"`, `'`.
-   *
-   * Setting `escapeParameterHtml` as true should not break existing functionality but provides a safeguard against a subtle type of XSS attack vectors.
-   *
-   * @VueI18nSee [HTML Message](../../guide/essentials/syntax#html-message)
-   *
-   * @defaultValue `false`
-   */
-  escapeParameterHtml?: Options['escapeParameter']
-  /**
-   * @remarks
-   * The shared locale messages of localization for components. More detail see Component based localization.
-   *
-   * @VueI18nSee [Shared locale messages for components](../../guide/essentials/local#shared-locale-messages-for-components)
-   *
-   * @defaultValue `undefined`
-   */
-  sharedMessages?: LocaleMessages<VueMessageType>
-  /**
-   * @remarks
-   * A set of rules for word pluralization
-   *
-   * @VueI18nSee [Custom Pluralization](../../guide/essentials/pluralization#custom-pluralization)
-   *
-   * @defaultValue `{}`
-   */
-  pluralizationRules?: Options['pluralRules']
-  /**
-   * @remarks
-   * A handler for post processing of translation. The handler gets after being called with the `$t`, and `t`.
-   *
-   * This handler is useful if you want to filter on translated text such as space trimming.
-   *
-   * @defaultValue `null`
-   */
-  postTranslation?: Options['postTranslation']
-  /**
-   * @remarks
-   * Whether synchronize the root level locale to the component localization locale.
-   *
-   * If `false`, regardless of the root level locale, localize for each component locale.
-   *
-   * @VueI18nSee [Local Scope](../../guide/essentials/scope#local-scope-2)
-   *
-   * @defaultValue `true`
-   */
-  sync?: boolean
-  /**
-   * @remarks
-   * A message resolver to resolve [`messages`](legacy#messages).
-   *
-   * If not specified, the vue-i18n internal message resolver will be used by default.
-   *
-   * You need to implement a message resolver yourself that supports the following requirements:
-   *
-   * - Resolve the message using the locale message of [`locale`](legacy#locale) passed as the first argument of the message resolver, and the path passed as the second argument.
-   *
-   * - If the message could not be resolved, you need to return `null`.
-   *
-   * - If you will be returned `null`, the message resolver will also be called on fallback if [`fallbackLocale`](legacy#fallbacklocale-2) is enabled, so the message will need to be resolved as well.
-   *
-   * The message resolver is called indirectly by the following APIs:
-   *
-   * - [`t`](legacy#t-key)
-   *
-   * - [`te`](legacy#te-key-locale)
-   *
-   * - [`tm`](legacy#tm-key)
-   *
-   * - [Translation component](component#translation)
-   *
-   * @example
-   * Here is an example of how to set it up using your `createI18n`:
-   * ```js
-   * import { createI18n } from 'vue-i18n'
-   *
-   * // your message resolver
-   * function messageResolver(obj, path) {
-   *   // simple message resolving!
-   *   const msg = obj[path]
-   *   return msg != null ? msg : null
-   * }
-   *
-   * // call with I18n option
-   * const i18n = createI18n({
-   *   locale: 'ja',
-   *   messageResolver, // set your message resolver
-   *   messages: {
-   *     en: { ... },
-   *     ja: { ... }
-   *   }
-   * })
-   *
-   * // the below your something to do ...
-   * // ...
-   * ```
-   *
-   * @VueI18nTip
-   * :new: v9.2+
-   *
-   * @VueI18nWarning
-   * If you use the message resolver, the [`flatJson`](legacy#flatjson) setting will be ignored. That is, you need to resolve the flat JSON by yourself.
-   *
-   * @VueI18nSee [Fallbacking](../../guide/essentials/fallback)
-   *
-   * @defaultValue `undefined`
-   */
-  messageResolver?: MessageResolver
-}
-
-/**
- * @internal
- *
- * @deprecated will be removed at vue-i18n v12
- */
-export interface VueI18nInternalOptions {
-  __extender?: VueI18nExtender
-}
-
-/**
- * Locale message translation functions for VueI18n legacy interfaces
- *
- * @remarks
- * This is the interface for {@link VueI18n}
- *
- * @deprecated will be removed at vue-i18n v12
- *
- * @VueI18nLegacy
- */
-export interface VueI18nTranslation<
-  Messages extends Record<string, any> = {},
-  Locales = 'en-US',
-  DefinedLocaleMessage extends
-    RemovedIndexResources<DefineLocaleMessage> = RemovedIndexResources<DefineLocaleMessage>,
-  C = IsEmptyObject<DefinedLocaleMessage> extends false
-    ? PickupPaths<{
-        [K in keyof DefinedLocaleMessage]: DefinedLocaleMessage[K]
-      }>
-    : never,
-  M = IsEmptyObject<Messages> extends false ? PickupKeys<Messages> : never,
-  ResourceKeys extends C | M = IsNever<C> extends false
-    ? IsNever<M> extends false
-      ? C | M
-      : C
-    : IsNever<M> extends false
-      ? M
-      : never
-> {
-  /**
-   * Locale message translation.
-   *
-   * @remarks
-   * If this is used in a reactive context, it will re-evaluate once the locale changes.
-   *
-   * If [i18n component options](injection#i18n) is specified, it’s translated in preferentially local scope locale messages than global scope locale messages.
-   *
-   * If [i18n component options](injection#i18n) isn't specified, it’s translated with global scope locale messages.
-   *
-   * @param key - A target locale message key
-   *
-   * @returns Translated message
-   *
-   * @VueI18nSee [Scope and Locale Changing](../../guide/essentials/scope)
-   */
-  <Key extends string>(key: Key | ResourceKeys): TranslateResult
-  /**
-   * Locale message translation for plurals
-   *
-   * @remarks
-   * Overloaded `t`. About details, see the [call signature](legacy#key-key-resourcekeys-translateresult) details.
-   *
-   * In this overloaded `t`, return a pluralized translation message.
-   *
-   * You can also suppress the warning, when the translation missing according to the options.
-   *
-   * @param key - A target locale message key
-   * @param plural - Which plural string to get. 1 returns the first one.
-   *
-   * @returns Translated message
-   *
-   * @VueI18nSee [Pluralization](../../guide/essentials/pluralization)
-   */
-  <Key extends string>(key: Key | ResourceKeys, plural: number): TranslateResult
-  /**
-   * Locale message translation for plurals
-   *
-   * @remarks
-   * Overloaded `t`. About details, see the [call signature](legacy#key-key-resourcekeys-translateresult) details.
-   *
-   * In this overloaded `t`, return a pluralized translation message.
-   *
-   * You can also suppress the warning, when the translation missing according to the options.
-   *
-   * About details of options, see the {@link TranslateOptions}.
-   *
-   * @param key - A target locale message key
-   * @param plural - Which plural string to get. 1 returns the first one.
-   * @param options - Additional {@link TranslateOptions | options} for translation
-   *
-   * @returns Translated message
-   *
-   * @VueI18nSee [Pluralization](../../guide/essentials/pluralization)
-   */
-  <Key extends string>(
-    key: Key | ResourceKeys,
-    plural: number,
-    options: TranslateOptions<Locales>
-  ): TranslateResult
-  /**
-   * Locale message translation for missing default message
-   *
-   * @remarks
-   * Overloaded `t`. About details, see the [call signature](legacy#key-key-resourcekeys-translateresult) details.
-   *
-   * In this overloaded `t`, if no translation was found, return a default message.
-   *
-   * You can also suppress the warning, when the translation missing according to the options.
-   *
-   * @param key - A target locale message key
-   * @param defaultMsg - A default message to return if no translation was found
-   *
-   * @returns Translated message
-   */
-  <Key extends string>(
-    key: Key | ResourceKeys,
-    defaultMsg: string
-  ): TranslateResult
-  /**
-   * Locale message translation for missing default message
-   *
-   * @remarks
-   * Overloaded `t`. About details, see the [call signature](legacy#key-key-resourcekeys-translateresult) details.
-   *
-   * In this overloaded `t`, if no translation was found, return a default message.
-   *
-   * You can also suppress the warning, when the translation missing according to the options.
-   *
-   * About details of options, see the {@link TranslateOptions}.
-   *
-   * @param key - A target locale message key
-   * @param defaultMsg - A default message to return if no translation was found
-   * @param options - Additional {@link TranslateOptions | options} for translation
-   *
-   * @returns Translated message
-   */
-  <Key extends string>(
-    key: Key | ResourceKeys,
-    defaultMsg: string,
-    options: TranslateOptions<Locales>
-  ): TranslateResult
-  /**
-   * Locale message translation.
-   *
-   * @remarks
-   * Overloaded `t`. About details, see the [call signature](legacy#key-key-resourcekeys-translateresult) details.
-   *
-   * @param key - A target locale message key
-   * @param list - A values of list interpolation
-   *
-   * @returns Translated message
-   *
-   * @VueI18nSee [List interpolation](../../guide/essentials/syntax#list-interpolation)
-   */
-  <Key extends string>(
-    key: Key | ResourceKeys,
-    list: unknown[]
-  ): TranslateResult
-  /**
-   * Locale message translation for list interpolations and plurals
-   *
-   * @remarks
-   * Overloaded `t`. About details, see the [call signature](legacy#key-key-resourcekeys-translateresult) details.
-   *
-   * In this overloaded `t`, the locale messages should contain a `{0}`, `{1}`, … for each placeholder in the list, and return a pluralized translation message.
-   *
-   * @param key - A target locale message key
-   * @param list - A values of list interpolation
-   * @param plural - Which plural string to get. 1 returns the first one.
-   *
-   * @returns Translated message
-   *
-   * @VueI18nSee [Pluralization](../../guide/essentials/pluralization)
-   * @VueI18nSee [List interpolation](../../guide/essentials/syntax#list-interpolation)
-   */
-  <Key extends string>(
-    key: Key | ResourceKeys,
-    list: unknown[],
-    plural: number
-  ): TranslateResult
-  /**
-   * Locale message translation for list interpolations and missing default message
-   *
-   * @remarks
-   * Overloaded `t`. About details, see the [call signature](legacy#key-key-resourcekeys-translateresult) details.
-   *
-   * In this overloaded `t`, the locale messages should contain a `{0}`, `{1}`, … for each placeholder in the list, and if no translation was found, return a default message.
-   *
-   * @param key - A target locale message key
-   * @param list - A values of list interpolation
-   * @param defaultMsg - A default message to return if no translation was found
-   *
-   * @returns Translated message
-   *
-   * @VueI18nSee [List interpolation](../../guide/essentials/syntax#list-interpolation)
-   */
-  <Key extends string>(
-    key: Key | ResourceKeys,
-    list: unknown[],
-    defaultMsg: string
-  ): TranslateResult
-  /**
-   * Locale message translation for list interpolations
-   *
-   * @remarks
-   * Overloaded `t`. About details, see the [call signature](legacy#key-key-resourcekeys-translateresult) details.
-   *
-   * In this overloaded `t`, the locale messages should contain a `{0}`, `{1}`, … for each placeholder in the list.
-   *
-   * You can also suppress the warning, when the translation missing according to the options.
-   *
-   * About details of options, see the {@link TranslateOptions}.
-   *
-   * @param key - A target locale message key
-   * @param list - A values of list interpolation
-   * @param options - Additional {@link TranslateOptions | options} for translation
-   *
-   * @returns Translated message
-   *
-   * @VueI18nSee [List interpolation](../../guide/essentials/syntax#list-interpolation)
-   */
-  <Key extends string>(
-    key: Key | ResourceKeys,
-    list: unknown[],
-    options: TranslateOptions<Locales>
-  ): TranslateResult
-  /**
-   * Locale message translation.
-   *
-   * @remarks
-   * Overloaded `t`. About details, see the [call signature](legacy#key-key-resourcekeys-translateresult) details.
-   *
-   * @param key - A target locale message key
-   * @param named - A values of named interpolation
-   *
-   * @returns Translated message
-   *
-   * @VueI18nSee [Named interpolation](../../guide/essentials/syntax#named-interpolation)
-   */
-  <Key extends string>(
-    key: Key | ResourceKeys,
-    named: Record<string, unknown>
-  ): TranslateResult
-  /**
-   * Locale message translation for named interpolations and plurals
-   *
-   * @remarks
-   * Overloaded `t`. About details, see the [call signature](legacy#key-key-resourcekeys-translateresult) details.
-   *
-   * In this overloaded `t`, for each placeholder x, the locale messages should contain a `{x}` token, and return a pluralized translation message.
-   *
-   * @param key - A target locale message key
-   * @param named - A values of named interpolation
-   * @param plural - Which plural string to get. 1 returns the first one.
-   *
-   * @returns Translated message
-   *
-   * @VueI18nSee [Pluralization](../../guide/essentials/pluralization)
-   * @VueI18nSee [Named interpolation](../../guide/essentials/syntax#named-interpolation)
-   */
-  <Key extends string>(
-    key: Key | ResourceKeys,
-    named: NamedValue,
-    plural: number
-  ): TranslateResult
-  /**
-   * Locale message translation for named interpolations and plurals
-   *
-   * @remarks
-   * Overloaded `t`. About details, see the [call signature](legacy#key-key-resourcekeys-translateresult) details.
-   *
-   * In this overloaded `t`, for each placeholder x, the locale messages should contain a `{x}` token, and if no translation was found, return a default message.
-   *
-   * @param key - A target locale message key
-   * @param named - A values of named interpolation
-   * @param defaultMsg - A default message to return if no translation was found
-   *
-   * @returns Translated message
-   *
-   * @VueI18nSee [Named interpolation](../../guide/essentials/syntax#named-interpolation)
-   */
-  <Key extends string>(
-    key: Key | ResourceKeys,
-    named: NamedValue,
-    defaultMsg: string
-  ): TranslateResult
-  /**
-   * Locale message translation for named interpolations
-   *
-   * @remarks
-   * Overloaded `t`. About details, see the [call signature](legacy#key-key-resourcekeys-translateresult) details.
-   *
-   * In this overloaded `t`, for each placeholder x, the locale messages should contain a `{x}` token.
-   *
-   * You can also suppress the warning, when the translation missing according to the options.
-   *
-   * About details of options, see the {@link TranslateOptions}.
-   *
-   * @param key - A target locale message key
-   * @param named - A values of named interpolation
-   * @param options - Additional {@link TranslateOptions | options} for translation
-   *
-   * @returns Translated message
-   *
-   * @VueI18nSee [Named interpolation](../../guide/essentials/syntax#named-interpolation)
-   */
-  <Key extends string>(
-    key: Key | ResourceKeys,
-    named: NamedValue,
-    options: TranslateOptions<Locales>
-  ): TranslateResult
-}
-
-/**
- * Resolve locale message translation functions for VueI18n legacy interfaces
- *
- * @deprecated will be removed at vue-i18n v12
- *
- * @remarks
- * This is the interface for {@link VueI18n}. This interface is an alias of {@link ComposerResolveLocaleMessageTranslation}.
- *
- * @VueI18nLegacy
- */
-export type VueI18nResolveLocaleMessageTranslation<Locales = 'en-US'> =
-  ComposerResolveLocaleMessageTranslation<Locales>
-
-/**
- * Datetime formatting functions for VueI18n legacy interfaces
- *
- * @remarks
- * This is the interface for {@link VueI18n}
- *
- * @deprecated will be removed at vue-i18n v12
- *
- * @VueI18nLegacy
- */
-export interface VueI18nDateTimeFormatting<
-  DateTimeFormats extends Record<string, any> = {},
-  Locales = 'en-US',
-  DefinedDateTimeFormat extends
-    RemovedIndexResources<DefineDateTimeFormat> = RemovedIndexResources<DefineDateTimeFormat>,
-  C = IsEmptyObject<DefinedDateTimeFormat> extends false
-    ? PickupFormatPathKeys<{
-        [K in keyof DefinedDateTimeFormat]: DefinedDateTimeFormat[K]
-      }>
-    : never,
-  M = IsEmptyObject<DateTimeFormats> extends false
-    ? PickupFormatKeys<DateTimeFormats>
-    : never,
-  ResourceKeys extends C | M = IsNever<C> extends false
-    ? IsNever<M> extends false
-      ? C | M
-      : C
-    : IsNever<M> extends false
-      ? M
-      : never
-> {
-  /**
-   * Datetime formatting
-   *
-   * @remarks
-   * If this is used in a reactive context, it will re-evaluate once the locale changes.
-   *
-   * If [i18n component options](injection#i18n) is specified, it’s formatted in preferentially local scope datetime formats than global scope locale messages.
-   *
-   * If [i18n component options](injection#i18n) isn't specified, it’s formatted with global scope datetime formats.
-   *
-   * @param value - A value, timestamp number or `Date` instance
-   *
-   * @returns Formatted value
-   *
-   * @VueI18nSee [Datetime formatting](../../guide/essentials/datetime)
-   */
-  (value: number | Date): DateTimeFormatResult
-  /**
-   * Datetime formatting
-   *
-   * @remarks
-   * Overloaded `d`. About details, see the [call signature](legacy#value-number-date-datetimeformatresult) details.
-   *
-   * @param value - A value, timestamp number or `Date` instance
-   * @param key - A key of datetime formats
-   *
-   * @returns Formatted value
-   */
-  <Value extends number | Date = number, Key extends string = string>(
-    value: Value,
-    key: Key | ResourceKeys
-  ): DateTimeFormatResult
-  /**
-   * Datetime formatting
-   *
-   * @remarks
-   * Overloaded `d`. About details, see the [call signature](legacy#value-number-date-datetimeformatresult) details.
-   *
-   * @param value - A value, timestamp number or `Date` instance
-   * @param key - A key of datetime formats
-   * @param locale - A locale, it will be used over than global scope or local scope.
-   *
-   * @returns Formatted value
-   */
-  <Value extends number | Date = number, Key extends string = string>(
-    value: Value,
-    key: Key | ResourceKeys,
-    locale: Locales
-  ): DateTimeFormatResult
-  /**
-   * Datetime formatting
-   *
-   * @remarks
-   * Overloaded `d`. About details, see the [call signature](legacy#value-number-date-datetimeformatresult) details.
-   *
-   * @param value - A value, timestamp number or `Date` instance
-   * @param args - An argument values
-   *
-   * @returns Formatted value
-   */
-  (
-    value: number | Date,
-    args: { [key: string]: string | boolean | number }
-  ): DateTimeFormatResult
-}
-
-/**
- * Number formatting functions for VueI18n legacy interfaces
- *
- * @remarks
- * This is the interface for {@link VueI18n}
- *
- * @deprecated will be removed at vue-i18n v12
- *
- * @VueI18nLegacy
- */
-export interface VueI18nNumberFormatting<
-  NumberFormats extends Record<string, any> = {},
-  Locales = 'en-US',
-  DefinedNumberFormat extends
-    RemovedIndexResources<DefineNumberFormat> = RemovedIndexResources<DefineNumberFormat>,
-  C = IsEmptyObject<DefinedNumberFormat> extends false
-    ? PickupFormatPathKeys<{
-        [K in keyof DefinedNumberFormat]: DefinedNumberFormat[K]
-      }>
-    : never,
-  M = IsEmptyObject<NumberFormats> extends false
-    ? PickupFormatKeys<NumberFormats>
-    : never,
-  ResourceKeys extends C | M = IsNever<C> extends false
-    ? IsNever<M> extends false
-      ? C | M
-      : C
-    : IsNever<M> extends false
-      ? M
-      : never
-> {
-  /**
-   * Number formatting
-   *
-   * @remarks
-   * If this is used in a reactive context, it will re-evaluate once the locale changes.
-   *
-   * If [i18n component options](injection#i18n) is specified, it’s formatted in preferentially local scope number formats than global scope locale messages.
-   *
-   * If [i18n component options](injection#i18n) isn't specified, it’s formatted with global scope number formats.
-   *
-   * @param value - A number value
-   *
-   * @returns Formatted value
-   *
-   * @VueI18nSee [Number formatting](../../guide/essentials/number)
-   */
-  (value: number): NumberFormatResult
-  /**
-   * Number formatting
-   *
-   * @remarks
-   * Overloaded `n`. About details, see the [call signature](legacy#value-number-numberformatresult) details.
-   *
-   * @param value - A number value
-   * @param key - A key of number formats
-   *
-   * @returns Formatted value
-   */
-  <Key extends string = string>(
-    value: number,
-    key: Key | ResourceKeys
-  ): NumberFormatResult
-  /**
-   * Number formatting
-   *
-   * @remarks
-   * Overloaded `n`. About details, see the [call signature](legacy#value-number-numberformatresult) details.
-   *
-   * @param value - A number value
-   * @param key - A key of number formats
-   * @param locale - A locale, it will be used over than global scope or local scope.
-   *
-   * @returns Formatted value
-   */
-  <Key extends string = string>(
-    value: number,
-    key: Key | ResourceKeys,
-    locale: Locales
-  ): NumberFormatResult
-  /**
-   * Number formatting
-   *
-   * @remarks
-   * Overloaded `n`. About details, see the [call signature](legacy#value-number-numberformatresult) details.
-   *
-   * @param value - A number value
-   * @param args - An argument values
-   *
-   * @returns Formatted value
-   */
-  (
-    value: number,
-    args: { [key: string]: string | boolean | number }
-  ): NumberFormatResult
-}
-
-/**
- *  VueI18n legacy interfaces
- *
- *  @remarks
- *  This interface is compatible with interface of `VueI18n` class (offered with Vue I18n v8.x).
- *
- * @deprecated will be removed at vue-i18n v12
- *
- *  @VueI18nLegacy
- */
-export interface VueI18n<
-  Messages extends Record<string, any> = {},
-  DateTimeFormats extends Record<string, any> = {},
-  NumberFormats extends Record<string, any> = {},
-  OptionLocale = Locale,
-  ResourceLocales =
-    | PickupLocales<NonNullable<Messages>>
-    | PickupLocales<NonNullable<DateTimeFormats>>
-    | PickupLocales<NonNullable<NumberFormats>>,
-  Locales = Locale extends GeneratedLocale
-    ? GeneratedLocale
-    : OptionLocale extends string
-      ? [ResourceLocales] extends [never]
-        ? Locale
-        : ResourceLocales
-      : OptionLocale | ResourceLocales,
-  Composition extends Composer<
-    Messages,
-    DateTimeFormats,
-    NumberFormats,
-    OptionLocale
-  > = Composer<Messages, DateTimeFormats, NumberFormats, OptionLocale>
-> {
-  /**
-   * @remarks
-   * Instance ID.
-   */
-  id: number
-  /**
-   * @remarks
-   * The current locale this VueI18n instance is using.
-   *
-   * If the locale contains a territory and a dialect, this locale contains an implicit fallback.
-   *
-   * @VueI18nSee [Scope and Locale Changing](../../guide/essentials/scope)
-   */
-  // locale: Locales
-  locale: Locales
-  /**
-   * @remarks
-   * The current fallback locales this VueI18n instance is using.
-   *
-   * @VueI18nSee [Fallbacking](../../guide/essentials/fallback)
-   */
-  fallbackLocale: FallbackLocales<Locales>
-  /**
-   * @remarks
-   * The list of available locales in `messages` in lexical order.
-   */
-  readonly availableLocales: Locales[]
-  /**
-   * @remarks
-   * The locale messages of localization.
-   *
-   * @VueI18nSee [Getting Started](../../guide/essentials/started)
-   */
-  readonly messages: { [K in keyof Messages]: Messages[K] }
-  /**
-   * @remarks
-   * The datetime formats of localization.
-   *
-   * @VueI18nSee [Datetime Formatting](../../guide/essentials/datetime)
-   */
-  readonly datetimeFormats: { [K in keyof DateTimeFormats]: DateTimeFormats[K] }
-  /**
-   * @remarks
-   * The number formats of localization.
-   *
-   * @VueI18nSee [Number Formatting](../../guide/essentials/number)
-   */
-  readonly numberFormats: { [K in keyof NumberFormats]: NumberFormats[K] }
-  /**
-   * @remarks
-   * Custom Modifiers for linked messages.
-   *
-   * @VueI18nSee [Custom Modifiers](../../guide/essentials/syntax#custom-modifiers)
-   */
-  readonly modifiers: Composition['modifiers']
-  /**
-   * @remarks
-   * A handler for localization missing.
-   */
-  missing: MissingHandler | null
-  /**
-   * @remarks
-   * A handler for post processing of translation.
-   */
-  postTranslation: PostTranslationHandler<VueMessageType> | null
-  /**
-   * @remarks
-   * Whether suppress warnings outputted when localization fails.
-   *
-   * @VueI18nSee [Fallbacking](../../guide/essentials/fallback)
-   */
-  silentTranslationWarn: Composition['missingWarn']
-  /**
-   * @remarks
-   * Whether suppress fallback warnings when localization fails.
-   */
-  silentFallbackWarn: Composition['fallbackWarn']
-  /**
-   * @remarks
-   * Whether suppress warnings when falling back to either `fallbackLocale` or root.
-   *
-   * @VueI18nSee [Fallbacking](../../guide/essentials/fallback)
-   */
-  formatFallbackMessages: Composition['fallbackFormat']
-  /**
-   * @remarks
-   * Whether synchronize the root level locale to the component localization locale.
-   *
-   * @VueI18nSee [Local Scope](../../guide/essentials/scope#local-scope-2)
-   */
-  sync: Composition['inheritLocale']
-  /**
-   * @remarks
-   * Whether to allow the use locale messages of HTML formatting.
-   *
-   * If you set `warn` or` error`, will check the locale messages on the VueI18n instance.
-   *
-   * If you are specified `warn`, a warning will be output at console.
-   *
-   * If you are specified `error` will occurred an Error.
-   *
-   * @VueI18nSee [HTML Message](../../guide/essentials/syntax#html-message)
-   * @VueI18nSee [Change `warnHtmlInMessage` option default value](../../guide/migration/breaking#change-warnhtmlinmessage-option-default-value)
-   */
-  warnHtmlInMessage: WarnHtmlInMessageLevel
-  /**
-   * @remarks
-   * Whether interpolation parameters are escaped before the message is translated.
-   *
-   * @VueI18nSee [HTML Message](../../guide/essentials/syntax#html-message)
-   */
-  escapeParameterHtml: Composition['escapeParameter']
-  /**
-   * A set of rules for word pluralization
-   *
-   * @VueI18nSee [Custom Pluralization](../../guide/essentials/pluralization#custom-pluralization)
-   */
-  pluralizationRules: Composition['pluralRules']
-  /**
-   * Locale message translation
-   *
-   * @remarks
-   * About details functions, See the {@link VueI18nTranslation}
-   */
-  t: VueI18nTranslation<
-    Messages,
-    Locales,
-    RemoveIndexSignature<{
-      [K in keyof DefineLocaleMessage]: DefineLocaleMessage[K]
-    }>
-  >
-  /**
-   * Resolve locale message translation
-   *
-   * @remarks
-   * About details functions, See the {@link VueI18nResolveLocaleMessageTranslation}
-   */
-  rt: VueI18nResolveLocaleMessageTranslation<Locales>
-  /**
-   * Translation locale message exist
-   *
-   * @remarks
-   * whether do exist locale message on VueI18n instance [messages](legacy#messages).
-   *
-   * If you specified `locale`, check the locale messages of `locale`.
-   *
-   * @param key - A target locale message key
-   * @param locale - A target locale
-   *
-   * @returns If found locale message, `true`, else `false`
-   */
-  te<
-    Str extends string,
-    Key extends PickupKeys<Messages> = PickupKeys<Messages>
-  >(
-    key: Str | Key,
-    locale?: Locales
-  ): boolean
-  /**
-   * Locale messages getter
-   *
-   * @remarks
-   * If [i18n component options](injection#i18n) is specified, it’s get in preferentially local scope locale messages than global scope locale messages.
-   *
-   * If [i18n component options](injection#i18n) isn't specified, it’s get with global scope locale messages.
-   *
-   * Based on the current `locale`, locale messages will be returned from Composer instance messages.
-   *
-   * If you change the `locale`, the locale messages returned will also correspond to the locale.
-   *
-   * If there are no locale messages for the given `key` in the composer instance messages, they will be returned with [fallbacking](../../guide/essentials/fallback).
-   *
-   * @VueI18nWarning
-   * You need to use `rt` for the locale message returned by `tm`. see the [rt](legacy#rt-message) details.
-   *
-   * @example
-   * template:
-   * ```html
-   * <div class="container">
-   *   <template v-for="content in $tm('contents')">
-   *     <h2>{{ $rt(content.title) }}</h2>
-   *     <p v-for="paragraph in content.paragraphs">
-   *      {{ $rt(paragraph) }}
-   *     </p>
-   *   </template>
-   * </div>
-   * ```
-   *
-   * ```js
-   * import { createI18n } from 'vue-i18n'
-   *
-   * const i18n = createI18n({
-   *   messages: {
-   *     en: {
-   *       contents: [
-   *         {
-   *           title: 'Title1',
-   *           // ...
-   *           paragraphs: [
-   *             // ...
-   *           ]
-   *         }
-   *       ]
-   *     }
-   *   }
-   *   // ...
-   * })
-   * ```
-   * @param key - A target locale message key
-   *
-   * @return Locale messages
-   */
-  tm: Composition['tm']
-  /**
-   * Get locale message
-   *
-   * @remarks
-   * get locale message from VueI18n instance [messages](legacy#messages).
-   *
-   * @param locale - A target locale
-   *
-   * @returns Locale messages
-   */
-  getLocaleMessage: Composition['getLocaleMessage']
-  /**
-   * Set locale message
-   *
-   * @remarks
-   * Set locale message to VueI18n instance [messages](legacy#messages).
-   *
-   * @param locale - A target locale
-   * @param message - A message
-   */
-  setLocaleMessage: Composition['setLocaleMessage']
-  /**
-   * Merge locale message
-   *
-   * @remarks
-   * Merge locale message to VueI18n instance [messages](legacy#messages).
-   *
-   * @param locale - A target locale
-   * @param message - A message
-   */
-  mergeLocaleMessage: Composition['mergeLocaleMessage']
-  /**
-   * Datetime formatting
-   *
-   * @remarks
-   * About details functions, See the {@link VueI18nDateTimeFormatting}
-   */
-  d: VueI18nDateTimeFormatting<
-    DateTimeFormats,
-    Locales,
-    RemoveIndexSignature<{
-      [K in keyof DefineDateTimeFormat]: DefineDateTimeFormat[K]
-    }>
-  >
-  /**
-   * Get datetime format
-   *
-   * @remarks
-   * get datetime format from VueI18n instance [datetimeFormats](legacy#datetimeformats).
-   *
-   * @param locale - A target locale
-   *
-   * @returns Datetime format
-   */
-  getDateTimeFormat: Composition['getDateTimeFormat']
-  /**
-   * Set datetime format
-   *
-   * @remarks
-   * Set datetime format to VueI18n instance [datetimeFormats](legacy#datetimeformats).
-   *
-   * @param locale - A target locale
-   * @param format - A target datetime format
-   */
-  setDateTimeFormat: Composition['setDateTimeFormat']
-  /**
-   * Merge datetime format
-   *
-   * @remarks
-   * Merge datetime format to VueI18n instance [datetimeFormats](legacy#datetimeformats).
-   *
-   * @param locale - A target locale
-   * @param format - A target datetime format
-   */
-  mergeDateTimeFormat: Composition['mergeDateTimeFormat']
-  /**
-   * Number Formatting
-   *
-   * @remarks
-   * About details functions, See the {@link VueI18nNumberFormatting}
-   */
-  n: VueI18nNumberFormatting<
-    NumberFormats,
-    Locales,
-    RemoveIndexSignature<{
-      [K in keyof DefineNumberFormat]: DefineNumberFormat[K]
-    }>
-  >
-  /**
-   * Get number format
-   *
-   * @remarks
-   * get number format from VueI18n instance [numberFormats](legacy#numberFormats).
-   *
-   * @param locale - A target locale
-   *
-   * @returns Number format
-   */
-  getNumberFormat: Composition['getNumberFormat']
-  /**
-   * Set number format
-   *
-   * @remarks
-   * Set number format to VueI18n instance [numberFormats](legacy#numberFormats).
-   *
-   * @param locale - A target locale
-   * @param format - A target number format
-   */
-  setNumberFormat: Composition['setNumberFormat']
-  /**
-   * Merge number format
-   *
-   * @remarks
-   * Merge number format to VueI18n instance [numberFormats](legacy#numberFormats).
-   *
-   * @param locale - A target locale
-   * @param format - A target number format
-   */
-  mergeNumberFormat: Composition['mergeNumberFormat']
-}
-
-/**
- * @internal
- *
- * @deprecated will be removed at vue-i18n v12
- */
-export interface VueI18nInternal<
-  Messages extends Record<string, any> = {},
-  DateTimeFormats extends Record<string, any> = {},
-  NumberFormats extends Record<string, any> = {}
-> {
-  __composer: Composer<Messages, DateTimeFormats, NumberFormats>
-  __enableEmitter?: (emitter: VueDevToolsEmitter) => void
-  __disableEmitter?: () => void
-  __extender?: VueI18nExtender
-  __disposer?: Disposer
-}
-
-/**
- * Convert to I18n Composer Options from VueI18n Options
- *
- * @internal
- */
-function convertComposerOptions<
-  Messages extends Record<string, any> = {},
-  DateTimeFormats extends Record<string, any> = {},
-  NumberFormats extends Record<string, any> = {}
->(
-  options: VueI18nOptions &
-    ComposerInternalOptions<Messages, DateTimeFormats, NumberFormats>
-): ComposerOptions &
-  ComposerInternalOptions<Messages, DateTimeFormats, NumberFormats> {
-  const locale = isString(options.locale) ? options.locale : DEFAULT_LOCALE
-  const fallbackLocale =
-    isString(options.fallbackLocale) ||
-    isArray(options.fallbackLocale) ||
-    isPlainObject(options.fallbackLocale) ||
-    options.fallbackLocale === false
-      ? options.fallbackLocale
-      : locale
-  const missing = isFunction(options.missing) ? options.missing : undefined
-  const missingWarn =
-    isBoolean(options.silentTranslationWarn) ||
-    isRegExp(options.silentTranslationWarn)
-      ? !options.silentTranslationWarn
-      : true
-  const fallbackWarn =
-    isBoolean(options.silentFallbackWarn) ||
-    isRegExp(options.silentFallbackWarn)
-      ? !options.silentFallbackWarn
-      : true
-  const fallbackRoot = isBoolean(options.fallbackRoot)
-    ? options.fallbackRoot
-    : true
-  const fallbackFormat = !!options.formatFallbackMessages
-  const modifiers = isPlainObject(options.modifiers) ? options.modifiers : {}
-  const pluralizationRules = options.pluralizationRules
-  const postTranslation = isFunction(options.postTranslation)
-    ? options.postTranslation
-    : undefined
-  const warnHtmlMessage = isString(options.warnHtmlInMessage)
-    ? options.warnHtmlInMessage !== 'off'
-    : true
-  const escapeParameter = !!options.escapeParameterHtml
-  const inheritLocale = isBoolean(options.sync) ? options.sync : true
-
-  let messages = options.messages
-  if (isPlainObject(options.sharedMessages)) {
-    const sharedMessages = options.sharedMessages
-    const locales: Locale[] = Object.keys(sharedMessages)
-    messages = locales.reduce(
-      (messages, locale) => {
-        const message = messages[locale] || (messages[locale] = {})
-        assign(message, sharedMessages[locale])
-        return messages
-      },
-      (messages || {}) as LocaleMessages<LocaleMessage<VueMessageType>>
-    )
-  }
-  const { __i18n, __root, __injectWithOption } = options
-
-  const datetimeFormats = options.datetimeFormats
-  const numberFormats = options.numberFormats
-  const flatJson = options.flatJson
-
-  return {
-    locale,
-    fallbackLocale,
-    messages,
-    flatJson,
-    datetimeFormats,
-    numberFormats,
-    missing,
-    missingWarn,
-    fallbackWarn,
-    fallbackRoot,
-    fallbackFormat,
-    modifiers,
-    pluralRules: pluralizationRules,
-    postTranslation,
-    warnHtmlMessage,
-    escapeParameter,
-    messageResolver: options.messageResolver,
-    inheritLocale,
-    __i18n,
-    __root,
-    __injectWithOption
-  }
-}
-
-export function createVueI18n<
-  Options extends VueI18nOptions = VueI18nOptions,
-  Messages extends Record<string, any> = Options['messages'] extends Record<
-    string,
-    any
-  >
-    ? Options['messages']
-    : {},
-  DateTimeFormats extends Record<
-    string,
-    any
-  > = Options['datetimeFormats'] extends Record<string, any>
-    ? Options['datetimeFormats']
-    : {},
-  NumberFormats extends Record<
-    string,
-    any
-  > = Options['numberFormats'] extends Record<string, any>
-    ? Options['numberFormats']
-    : {}
->(options?: Options): VueI18n<Messages, DateTimeFormats, NumberFormats>
-
-export function createVueI18n<
-  Schema extends object = DefaultLocaleMessageSchema,
-  Locales extends string | object = 'en-US',
-  Options extends VueI18nOptions<
-    SchemaParams<Schema, VueMessageType>,
-    LocaleParams<Locales>
-  > = VueI18nOptions<
-    SchemaParams<Schema, VueMessageType>,
-    LocaleParams<Locales>
-  >,
-  Messages extends Record<string, any> = NonNullable<
-    Options['messages']
-  > extends Record<string, any>
-    ? NonNullable<Options['messages']>
-    : {},
-  DateTimeFormats extends Record<string, any> = NonNullable<
-    Options['datetimeFormats']
-  > extends Record<string, any>
-    ? NonNullable<Options['datetimeFormats']>
-    : {},
-  NumberFormats extends Record<string, any> = NonNullable<
-    Options['numberFormats']
-  > extends Record<string, any>
-    ? NonNullable<Options['numberFormats']>
-    : {}
->(options?: Options): VueI18n<Messages, DateTimeFormats, NumberFormats>
-
-/**
- * create VueI18n interface factory
- *
- * @internal
- *
- * @deprecated will be removed at vue-i18n v12
- */
-
-export function createVueI18n(options: any = {}): any {
-  type Message = VueMessageType
-
-  const composer = createComposer(convertComposerOptions(options)) as Composer
-  const { __extender } = options as unknown as VueI18nInternalOptions
-
-  // defines VueI18n
-  const vueI18n = {
-    // id
-    id: composer.id,
-
-    // locale
-    get locale(): Locale {
-      return composer.locale.value as Locale
-    },
-    set locale(val: Locale) {
-      composer.locale.value = val as any
-    },
-
-    // fallbackLocale
-    get fallbackLocale(): FallbackLocale {
-      return composer.fallbackLocale.value as FallbackLocale
-    },
-    set fallbackLocale(val: FallbackLocale) {
-      composer.fallbackLocale.value = val as any
-    },
-
-    // messages
-    get messages(): LocaleMessages<Message> {
-      return composer.messages.value
-    },
-
-    // datetimeFormats
-    get datetimeFormats(): DateTimeFormatsType {
-      return composer.datetimeFormats.value
-    },
-
-    // numberFormats
-    get numberFormats(): NumberFormatsType {
-      return composer.numberFormats.value
-    },
-
-    // availableLocales
-    get availableLocales(): Locale[] {
-      return composer.availableLocales.value
-    },
-
-    // missing
-    get missing(): MissingHandler | null {
-      return composer.getMissingHandler()
-    },
-    set missing(handler: MissingHandler | null) {
-      composer.setMissingHandler(handler)
-    },
-
-    // silentTranslationWarn
-    get silentTranslationWarn(): boolean | RegExp {
-      return isBoolean(composer.missingWarn)
-        ? !composer.missingWarn
-        : composer.missingWarn
-    },
-    set silentTranslationWarn(val: boolean | RegExp) {
-      composer.missingWarn = isBoolean(val) ? !val : val
-    },
-
-    // silentFallbackWarn
-    get silentFallbackWarn(): boolean | RegExp {
-      return isBoolean(composer.fallbackWarn)
-        ? !composer.fallbackWarn
-        : composer.fallbackWarn
-    },
-    set silentFallbackWarn(val: boolean | RegExp) {
-      composer.fallbackWarn = isBoolean(val) ? !val : val
-    },
-
-    // modifiers
-    get modifiers(): LinkedModifiers<Message> {
-      return composer.modifiers
-    },
-
-    // formatFallbackMessages
-    get formatFallbackMessages(): boolean {
-      return composer.fallbackFormat
-    },
-    set formatFallbackMessages(val: boolean) {
-      composer.fallbackFormat = val
-    },
-
-    // postTranslation
-    get postTranslation(): PostTranslationHandler<Message> | null {
-      return composer.getPostTranslationHandler()
-    },
-    set postTranslation(handler: PostTranslationHandler<Message> | null) {
-      composer.setPostTranslationHandler(handler)
-    },
-
-    // sync
-    get sync(): boolean {
-      return composer.inheritLocale
-    },
-    set sync(val: boolean) {
-      composer.inheritLocale = val
-    },
-
-    // warnInHtmlMessage
-    get warnHtmlInMessage(): WarnHtmlInMessageLevel {
-      return composer.warnHtmlMessage ? 'warn' : 'off'
-    },
-    set warnHtmlInMessage(val: WarnHtmlInMessageLevel) {
-      composer.warnHtmlMessage = val !== 'off'
-    },
-
-    // escapeParameterHtml
-    get escapeParameterHtml(): boolean {
-      return composer.escapeParameter
-    },
-    set escapeParameterHtml(val: boolean) {
-      composer.escapeParameter = val
-    },
-
-    // pluralizationRules
-    get pluralizationRules(): PluralizationRules {
-      return composer.pluralRules || {}
-    },
-
-    // for internal
-    __composer: composer,
-
-    // t
-    t(...args: unknown[]): TranslateResult {
-      return Reflect.apply(composer.t, composer, [...args])
-    },
-
-    // rt
-    rt(...args: unknown[]): TranslateResult {
-      return Reflect.apply(composer.rt, composer, [...args])
-    },
-
-    // te
-    te(key: Path, locale?: Locale): boolean {
-      return composer.te(key, locale)
-    },
-
-    // tm
-    tm(key: Path): LocaleMessageValue<VueMessageType> | {} {
-      return composer.tm(key)
-    },
-
-    // getLocaleMessage
-    getLocaleMessage(locale: Locale): LocaleMessageDictionary<VueMessageType> {
-      return composer.getLocaleMessage(locale)
-    },
-
-    // setLocaleMessage
-    setLocaleMessage(
-      locale: Locale,
-      message: LocaleMessageDictionary<VueMessageType>
-    ): void {
-      composer.setLocaleMessage(locale, message)
-    },
-
-    // mergeLocaleMessage
-    mergeLocaleMessage(
-      locale: Locale,
-      message: LocaleMessageDictionary<VueMessageType>
-    ): void {
-      composer.mergeLocaleMessage(locale, message as any)
-    },
-
-    // d
-    d(...args: unknown[]): DateTimeFormatResult {
-      return Reflect.apply(composer.d, composer, [...args])
-    },
-
-    // getDateTimeFormat
-    getDateTimeFormat(locale: Locale): DateTimeFormat {
-      return composer.getDateTimeFormat(locale)
-    },
-
-    // setDateTimeFormat
-    setDateTimeFormat(locale: Locale, format: DateTimeFormat): void {
-      composer.setDateTimeFormat(locale, format)
-    },
-
-    // mergeDateTimeFormat
-    mergeDateTimeFormat(locale: Locale, format: DateTimeFormat): void {
-      composer.mergeDateTimeFormat(locale, format)
-    },
-
-    // n
-    n(...args: unknown[]): NumberFormatResult {
-      return Reflect.apply(composer.n, composer, [...args])
-    },
-
-    // getNumberFormat
-    getNumberFormat(locale: Locale): NumberFormat {
-      return composer.getNumberFormat(locale)
-    },
-
-    // setNumberFormat
-    setNumberFormat(locale: Locale, format: NumberFormat): void {
-      composer.setNumberFormat(locale, format)
-    },
-
-    // mergeNumberFormat
-    mergeNumberFormat(locale: Locale, format: NumberFormat): void {
-      composer.mergeNumberFormat(locale, format)
-    }
-  }
-
-  // custom extender for vue-i18n-routing and nuxt i18n
-  ;(vueI18n as unknown as VueI18nInternal).__extender = __extender
-
-  // for vue-devtools timeline event
-  if (__DEV__) {
-    ;(vueI18n as unknown as VueI18nInternal).__enableEmitter = (
-      emitter: VueDevToolsEmitter
-    ): void => {
-      const __composer = composer as any
-      __composer[EnableEmitter] && __composer[EnableEmitter](emitter)
-    }
-    ;(vueI18n as unknown as VueI18nInternal).__disableEmitter = (): void => {
-      const __composer = composer as any
-      __composer[DisableEmitter] && __composer[DisableEmitter]()
-    }
-  }
-
-  return vueI18n
-}
-
-/* eslint-enable @typescript-eslint/no-explicit-any */
diff --git a/packages/vue-i18n-core/src/petite.ts b/packages/vue-i18n-core/src/petite.ts
index c3031f00d..878d1b69d 100644
--- a/packages/vue-i18n-core/src/petite.ts
+++ b/packages/vue-i18n-core/src/petite.ts
@@ -62,22 +62,6 @@ export type {
   I18nScope,
   UseI18nOptions
 } from './i18n'
-export type {
-  Choice,
-  DateTimeFormatResult,
-  LocaleMessageObject,
-  NumberFormatResult,
-  PluralizationRulesMap,
-  TranslateResult,
-  VueI18n,
-  VueI18nDateTimeFormatting,
-  VueI18nExtender,
-  VueI18nNumberFormatting,
-  VueI18nOptions,
-  VueI18nResolveLocaleMessageTranslation,
-  VueI18nTranslation,
-  WarnHtmlInMessageLevel
-} from './legacy'
 export { initDev, initFeatureFlags, VERSION } from './misc'
 export type { I18nPluginOptions } from './plugin'
 export type { Disposer } from './types'
diff --git a/packages/vue-i18n-core/src/types.ts b/packages/vue-i18n-core/src/types.ts
index b83ab54bb..894b911ec 100644
--- a/packages/vue-i18n-core/src/types.ts
+++ b/packages/vue-i18n-core/src/types.ts
@@ -1,6 +1,4 @@
-import type { IsNever } from '@intlify/core-base'
 import type { ExportedGlobalComposer } from './i18n'
-import type { VueI18n } from './legacy'
 
 export type Disposer = () => void
 
@@ -26,20 +24,5 @@ export type Disposer = () => void
 
 export interface GeneratedTypeConfig {}
 
-/**
- * Narrowed i18n instance type based on `GeneratedTypeConfig['legacy']`
- *
- * - `never` (unset) resolves to `VueI18n | ExportedGlobalComposer`
- * - `true` resolves to `VueI18n`
- * - `false` resolves to `ExportedGlobalComposer`
- */
-export type GeneratedInstanceType =
-  GeneratedTypeConfig extends Record<'legacy', infer Legacy> ? Legacy : never
-
 /** @VueI18nGeneral */
-export type VueI18nInstance =
-  IsNever<GeneratedInstanceType> extends true
-    ? VueI18n | ExportedGlobalComposer
-    : GeneratedInstanceType extends true
-      ? VueI18n
-      : ExportedGlobalComposer
+export type VueI18nInstance = ExportedGlobalComposer
diff --git a/packages/vue-i18n-core/test/legacy.test-d.ts b/packages/vue-i18n-core/test/legacy.test-d.ts
deleted file mode 100644
index eacc42e3e..000000000
--- a/packages/vue-i18n-core/test/legacy.test-d.ts
+++ /dev/null
@@ -1,231 +0,0 @@
-import { createVueI18n } from '../src/legacy'
-
-import type {
-  DateTimeFormat,
-  FallbackLocale,
-  Locale,
-  NumberFormat,
-  PickupFallbackLocales
-} from '@intlify/core-base'
-import type { ResourceSchema } from './schema'
-
-// loose options
-const looseOptions = {
-  locale: 'en',
-  fallbackLocale: {
-    ja: ['en']
-  },
-  messages: {
-    en: {
-      foo: 'foo',
-      nest: {
-        bar: 'bar'
-      },
-      errors: ['error1']
-    },
-    ja: {
-      bar: 'foo',
-      nest: {
-        bar: 'bar'
-      },
-      errors: ['error2']
-    }
-  },
-  datetimeFormats: {
-    'en-US': {
-      short: {}
-    }
-  },
-  numberFormats: {
-    'ja-JP': {
-      currency: {}
-    }
-  }
-}
-
-// strict options
-const strictOptions = {
-  locale: 'en',
-  fallbackLocale: {
-    ja: ['en']
-  },
-  messages: {
-    en: {
-      foo: 'foo',
-      nest: {
-        bar: 'bar'
-      },
-      errors: ['error1']
-    },
-    ja: {
-      foo: 'foo',
-      nest: {
-        bar: 'bar'
-      },
-      errors: ['error2']
-    }
-  }
-}
-
-test('loose legacy', () => {
-  const looseVueI18n = createVueI18n(looseOptions)
-
-  expectTypeOf(looseVueI18n.locale).toEqualTypeOf<
-    'en' | 'ja' | 'en-US' | 'ja-JP'
-  >()
-  expectTypeOf(looseVueI18n.fallbackLocale).toEqualTypeOf<
-    | 'en'
-    | 'ja'
-    | 'en-US'
-    | 'ja-JP'
-    | ('en' | 'ja' | 'en-US' | 'ja-JP')[]
-    | {
-        [x in string]: PickupFallbackLocales<
-          ['en' | 'ja' | 'en-US' | 'ja-JP']
-        >[]
-      }
-    | false
-  >()
-  expectTypeOf(looseVueI18n.messages).toEqualTypeOf<{
-    en: { foo: string; nest: { bar: string }; errors: string[] }
-    ja: { bar: string; nest: { bar: string }; errors: string[] }
-  }>()
-  expectTypeOf(looseVueI18n.datetimeFormats).toEqualTypeOf<{
-    'en-US': { short: {} }
-  }>()
-  expectTypeOf(looseVueI18n.numberFormats).toEqualTypeOf<{
-    'ja-JP': { currency: {} }
-  }>()
-  expectTypeOf(looseVueI18n.t('nest.bar')).toEqualTypeOf<string>()
-  expectTypeOf(looseVueI18n.t('nest', 'en')).toEqualTypeOf<string>()
-  expectTypeOf(looseVueI18n.t('foo', [1])).toEqualTypeOf<string>()
-  expectTypeOf(looseVueI18n.t('nest', { foo: 1 })).toEqualTypeOf<string>()
-  expectTypeOf(looseVueI18n.te('errors', 'en')).toEqualTypeOf<boolean>()
-  expectTypeOf(looseVueI18n.tm('nest')).toEqualTypeOf<{ bar: string }>()
-  expectTypeOf(looseVueI18n.tm('errors')).toEqualTypeOf<string[]>()
-  expectTypeOf(looseVueI18n.rt('foo')).toEqualTypeOf<string>()
-  expectTypeOf(looseVueI18n.getLocaleMessage('en')).toEqualTypeOf<{
-    foo: string
-    nest: { bar: string }
-    errors: string[]
-  }>()
-  expectTypeOf(
-    looseVueI18n.getLocaleMessage<{ japan: string }>('japan')
-  ).toEqualTypeOf<{ japan: string }>()
-
-  looseVueI18n.setLocaleMessage('en', {
-    foo: 'foo',
-    nest: {
-      bar: 'bar'
-    },
-    errors: ['error1']
-  })
-  looseVueI18n.setLocaleMessage<{ dio: string }>('jojo', { dio: 'dio' })
-  looseVueI18n.mergeLocaleMessage('en', {
-    bar: 'foo'
-  })
-  looseVueI18n.setDateTimeFormat('ja-JP', {
-    short: {
-      hour: 'numeric'
-    }
-  })
-  looseVueI18n.setDateTimeFormat<{ stop: { hour: string } }>('world', {
-    stop: { hour: 'infinity' }
-  })
-  looseVueI18n.mergeDateTimeFormat('en-US', {
-    long: { hour: 'numeric' }
-  })
-  looseVueI18n.mergeDateTimeFormat<{ stop: { hour: string } }>('en-US', {
-    stop: { hour: 'infinity' }
-  })
-
-  expectTypeOf(looseVueI18n.getDateTimeFormat('en-US')).toEqualTypeOf<{
-    short: {}
-  }>()
-  expectTypeOf(
-    looseVueI18n.getDateTimeFormat<{ long: { hour: string } }>('en-US')
-  ).toEqualTypeOf<{ long: { hour: string } }>()
-
-  looseVueI18n.setNumberFormat('en-US', {
-    currency: {
-      currecy: 'USD'
-    }
-  })
-  looseVueI18n.setNumberFormat<{ echoes: { act: string } }>('stand', {
-    echoes: { act: '2' }
-  })
-  looseVueI18n.mergeNumberFormat('ja-JP', {
-    weight: {
-      unit: 'kiro'
-    }
-  })
-  looseVueI18n.mergeNumberFormat<{ echoes: { act: string } }>('ja-JP', {
-    echoes: { act: '2' }
-  })
-})
-
-test('strict legacy', () => {
-  const strictVueI18n = createVueI18n<[ResourceSchema], 'en' | 'ja'>(
-    strictOptions
-  )
-
-  expectTypeOf(strictVueI18n.locale).toEqualTypeOf<'en' | 'ja'>()
-  expectTypeOf(strictVueI18n.fallbackLocale).toEqualTypeOf<
-    | 'en'
-    | 'ja'
-    | ('en' | 'ja')[]
-    | { [x in string]: PickupFallbackLocales<['en' | 'ja']>[] }
-    | false
-  >()
-  expectTypeOf(strictVueI18n.messages).toEqualTypeOf<{
-    en: { foo: string; nest: { bar: string }; errors: string[] }
-    ja: { foo: string; nest: { bar: string }; errors: string[] }
-  }>()
-  expectTypeOf(strictVueI18n.datetimeFormats).toEqualTypeOf<{
-    en: DateTimeFormat
-    ja: DateTimeFormat
-  }>()
-  expectTypeOf(strictVueI18n.numberFormats).toEqualTypeOf<{
-    en: NumberFormat
-    ja: NumberFormat
-  }>()
-  expectTypeOf(strictVueI18n.t('nest.bar')).toEqualTypeOf<string>()
-  expectTypeOf(strictVueI18n.t('nest', 'en')).toEqualTypeOf<string>()
-  expectTypeOf(strictVueI18n.t('foo', [1])).toEqualTypeOf<string>()
-  expectTypeOf(strictVueI18n.t('nest', { foo: 1 })).toEqualTypeOf<string>()
-  expectTypeOf(strictVueI18n.te('errors', 'en')).toEqualTypeOf<boolean>()
-  expectTypeOf(strictVueI18n.tm('nest')).toEqualTypeOf<{ bar: string }>()
-  expectTypeOf(strictVueI18n.tm('errors')).toEqualTypeOf<string[]>()
-  expectTypeOf(strictVueI18n.rt('foo')).toEqualTypeOf<string>()
-  expectTypeOf(strictVueI18n.getLocaleMessage('en')).toEqualTypeOf<{
-    foo: string
-    nest: { bar: string }
-    errors: string[]
-  }>()
-  expectTypeOf(
-    strictVueI18n.getLocaleMessage<{ japan: string }>('japan')
-  ).toEqualTypeOf<{ japan: string }>()
-
-  strictVueI18n.setLocaleMessage('en', {
-    foo: 'foo',
-    nest: {
-      bar: 'bar'
-    },
-    errors: ['error1']
-  })
-  strictVueI18n.setLocaleMessage<{ dio: string }>('jojo', {
-    dio: 'The world!'
-  })
-  strictVueI18n.mergeLocaleMessage('en', {
-    bar: 'foo'
-  })
-  strictVueI18n.mergeLocaleMessage<{ dio: string }>('en', {
-    dio: 'The world!'
-  })
-
-  const nullVueI18n = createVueI18n({})
-  expectTypeOf(nullVueI18n.locale).toEqualTypeOf<Locale>()
-  nullVueI18n.locale = 'en'
-  expectTypeOf(nullVueI18n.fallbackLocale).toEqualTypeOf<FallbackLocale>()
-  nullVueI18n.fallbackLocale = 'fr'
-})
diff --git a/packages/vue-i18n-core/test/legacy.test.ts b/packages/vue-i18n-core/test/legacy.test.ts
deleted file mode 100644
index 3e4bc1a76..000000000
--- a/packages/vue-i18n-core/test/legacy.test.ts
+++ /dev/null
@@ -1,592 +0,0 @@
-/* eslint-disable @typescript-eslint/no-empty-function */
-
-// utils
-import * as shared from '@intlify/shared'
-vi.mock('@intlify/shared', async () => {
-  const actual = await vi.importActual<object>('@intlify/shared')
-  return {
-    ...actual,
-    warn: vi.fn(),
-    warnOnce: vi.fn()
-  }
-})
-
-import {
-  compile,
-  registerMessageCompiler,
-  registerMessageResolver,
-  resolveValue
-} from '@intlify/core-base'
-import { nextTick, watchEffect } from 'vue'
-import { createVueI18n } from '../src/legacy'
-import { pluralRules as _pluralRules } from './helper'
-
-import type { MessageContext, Path, PathValue } from '@intlify/core-base'
-import type { VueMessageType } from '../src/composer'
-
-beforeEach(() => {
-  registerMessageCompiler(compile)
-  registerMessageResolver(resolveValue)
-})
-
-test('locale', () => {
-  const i18n = createVueI18n()
-  expect(i18n.locale).toEqual('en-US')
-  i18n.locale = 'ja'
-  expect(i18n.locale).toEqual('ja')
-})
-
-test('fallbackLocale', () => {
-  const i18n = createVueI18n()
-  expect(i18n.fallbackLocale).toEqual('en-US')
-  i18n.fallbackLocale = 'ja'
-  expect(i18n.fallbackLocale).toEqual('ja')
-})
-
-describe('availableLocales', () => {
-  test('initialize messages', async () => {
-    const i18n = createVueI18n({
-      messages: {
-        en: {},
-        ja: {},
-        fr: {}
-      }
-    })
-    expect(i18n.availableLocales).toEqual(['en', 'ja', 'fr'].sort())
-  })
-  test('reactive update', () => {
-    const i18n = createVueI18n({
-      messages: {
-        en: {},
-        ja: {},
-        fr: {}
-      }
-    })
-    i18n.setLocaleMessage('ru', { hello: 'Привет мир!' })
-    expect(i18n.availableLocales).toEqual(['en', 'ja', 'fr', 'ru'].sort())
-  })
-  test('trigger new value with watchEffect', async () => {
-    const i18n = createVueI18n({
-      messages: {
-        ja: {}
-      }
-    })
-    let locales = [] as string[]
-
-    watchEffect(() => {
-      locales = i18n.availableLocales
-    })
-
-    i18n.setLocaleMessage('en', { hello: 'Hello' })
-    await nextTick()
-    expect(locales.sort()).toEqual(['en', 'ja'].sort())
-  })
-})
-
-test('missing', () => {
-  const i18n = createVueI18n()
-  expect(i18n.missing).toEqual(null)
-  const handler = (_: unknown, key: string) => {
-    return key.toUpperCase()
-  }
-  i18n.missing = handler
-  expect(i18n.missing).toEqual(handler)
-  expect(i18n.t('foo.bar.buz')).toEqual('FOO.BAR.BUZ')
-})
-
-test('silentTranslationWarn', () => {
-  // default
-  const i18n = createVueI18n()
-  expect(i18n.silentTranslationWarn).toEqual(false)
-  i18n.silentTranslationWarn = true
-  expect(i18n.silentTranslationWarn).toEqual(true)
-  i18n.silentTranslationWarn = /^hi.*$/
-  expect(i18n.silentTranslationWarn).toEqual(/^hi.*$/)
-
-  // with option
-  const i18nWithOption = createVueI18n({ silentTranslationWarn: true })
-  expect(i18nWithOption.silentTranslationWarn).toEqual(true)
-})
-
-test('silentFallbackWarn', () => {
-  // default
-  const i18n = createVueI18n()
-  expect(i18n.silentFallbackWarn).toEqual(false)
-  i18n.silentFallbackWarn = true
-  expect(i18n.silentFallbackWarn).toEqual(true)
-  i18n.silentFallbackWarn = /^hi.*$/
-  expect(i18n.silentFallbackWarn).toEqual(/^hi.*$/)
-
-  // with option
-  const i18nWithOption = createVueI18n({ silentFallbackWarn: true })
-  expect(i18nWithOption.silentFallbackWarn).toEqual(true)
-})
-
-test('formatFallbackMessages', () => {
-  // default
-  const i18n = createVueI18n()
-  expect(i18n.formatFallbackMessages).toEqual(false)
-  i18n.formatFallbackMessages = true
-  expect(i18n.formatFallbackMessages).toEqual(true)
-
-  // withOption
-  const i18nWithOption = createVueI18n({ formatFallbackMessages: true })
-  expect(i18nWithOption.formatFallbackMessages).toEqual(true)
-})
-
-test('postTranslation', () => {
-  const i18n = createVueI18n()
-  expect(i18n.postTranslation).toEqual(null)
-  const postTranslation = <VueMessageType>(str: VueMessageType) =>
-    shared.isString(str) ? str.trim() : str
-  i18n.postTranslation = postTranslation
-  expect(i18n.postTranslation).toEqual(postTranslation)
-})
-
-test('pluralizationRules', () => {
-  const i18n = createVueI18n({
-    locale: 'ru',
-    pluralizationRules: _pluralRules,
-    messages: {
-      ru: {
-        car: '0 машин | {n} машина | {n} машины | {n} машин'
-      }
-    }
-  })
-
-  expect(i18n.pluralizationRules).toEqual(_pluralRules)
-  expect(i18n.t('car', 1)).toEqual('1 машина')
-  expect(i18n.t('car', 2)).toEqual('2 машины')
-  expect(i18n.t('car', 4)).toEqual('4 машины')
-  expect(i18n.t('car', 12)).toEqual('12 машин')
-  expect(i18n.t('car', 21)).toEqual('21 машина')
-})
-
-test('messages', () => {
-  const i18n = createVueI18n()
-  expect(i18n.messages).toEqual({
-    'en-US': {}
-  })
-})
-
-test('datetimeFormats', () => {
-  const i18n = createVueI18n()
-  expect(i18n.datetimeFormats).toEqual({
-    'en-US': {}
-  })
-})
-
-test('numberFormats', () => {
-  const i18n = createVueI18n()
-  expect(i18n.numberFormats).toEqual({
-    'en-US': {}
-  })
-})
-
-describe('t', () => {
-  test('basic', () => {
-    const i18n = createVueI18n({
-      locale: 'en',
-      messages: {
-        en: {
-          name: 'kazupon',
-          hello: 'Hello!',
-          hi: 'hi {name}!',
-          morning: 'good morning {0}',
-          linked: 'hi @.upper:name'
-        }
-      }
-    })
-
-    expect(i18n.t('hello')).toEqual('Hello!')
-    expect(i18n.t('hi', { name: 'kazupon' })).toEqual('hi kazupon!')
-    expect(i18n.t('morning', ['kazupon'])).toEqual('good morning kazupon')
-    expect(i18n.t('linked')).toEqual('hi KAZUPON')
-  })
-})
-
-describe('rt', () => {
-  test('compilation', () => {
-    const i18n = createVueI18n({
-      locale: 'en',
-      messages: {
-        en: {
-          text: 'hi dio!',
-          list: 'hi {0}!',
-          named: 'hi {name}!',
-          name: 'dio',
-          linked: 'hi @.upper:name !',
-          pural: 'no apples | one apple | {count} apples'
-        }
-      }
-    })
-
-    expect(i18n.rt(i18n.messages.en.text)).toEqual('hi dio!')
-    expect(i18n.rt(i18n.messages.en.list, ['dio'])).toEqual('hi dio!')
-    expect(i18n.rt(i18n.messages.en.named, { name: 'dio' })).toEqual('hi dio!')
-    expect(i18n.rt(i18n.messages.en.linked)).toEqual('hi DIO !')
-    expect(i18n.rt(i18n.messages.en.pural, 2)).toEqual('2 apples')
-  })
-
-  test('message functions', () => {
-    const i18n = createVueI18n({
-      locale: 'en',
-      messages: {
-        en: {
-          text: () => 'hi dio!',
-          list: (ctx: MessageContext<VueMessageType>) => `hi ${ctx.list(0)}!`,
-          named: (ctx: MessageContext<VueMessageType>) =>
-            `hi ${ctx.named('name')}!`,
-          name: 'dio',
-          linked: (ctx: MessageContext<VueMessageType>) =>
-            `hi ${ctx.linked('name', 'upper')} !`,
-          pural: (ctx: MessageContext<VueMessageType>) =>
-            ctx.plural([
-              'no apples',
-              'one apple',
-              `${ctx.named('count')} apples`
-            ]) as string
-        }
-      }
-    })
-
-    expect(i18n.rt(i18n.messages.en.text)).toEqual('hi dio!')
-    expect(i18n.rt(i18n.messages.en.list, ['dio'])).toEqual('hi dio!')
-    expect(i18n.rt(i18n.messages.en.named, { name: 'dio' })).toEqual('hi dio!')
-    expect(i18n.rt(i18n.messages.en.linked)).toEqual('hi DIO !')
-    expect(i18n.rt(i18n.messages.en.pural, 2)).toEqual('2 apples')
-  })
-})
-
-test('te', () => {
-  const i18n = createVueI18n({
-    locale: 'en',
-    messages: {
-      en: {
-        message: {
-          hello: 'Hello!'
-        }
-      },
-      ja: {}
-    }
-  })
-
-  expect(i18n.te('message.hello')).toEqual(true)
-  expect(i18n.te('message.hallo')).toEqual(false)
-  expect(i18n.te('message.hallo', 'ja')).toEqual(false)
-})
-
-test('tm', async () => {
-  const i18n = createVueI18n({
-    locale: 'ja',
-    messages: {
-      en: {},
-      ja: {
-        foo: {
-          bar: {
-            buz: 'hello'
-          },
-          codes: {
-            errors: ['error1', 'error2']
-          }
-        }
-      }
-    }
-  })
-
-  let messages1 = i18n.tm('foo.bar')
-  let messages2 = i18n.tm('foo.codes')
-  expect(messages1).toEqual({ buz: 'hello' })
-  expect(messages2).toEqual({ errors: ['error1', 'error2'] })
-
-  watchEffect(() => {
-    messages1 = i18n.tm('foo.bar')
-    messages2 = i18n.tm('foo.codes')
-  })
-
-  i18n.locale = 'en'
-  await nextTick()
-
-  expect(messages1).toEqual({ buz: 'hello' })
-  expect(messages2).toEqual({ errors: ['error1', 'error2'] })
-})
-
-test('getLocaleMessage / setLocaleMessage / mergeLocaleMessage', () => {
-  const i18n = createVueI18n({
-    messages: {
-      en: { hello: 'Hello!' }
-    }
-  })
-  expect(i18n.getLocaleMessage('en')).toEqual({ hello: 'Hello!' })
-
-  i18n.setLocaleMessage<{ hi: { hi: string } }>('en', { hi: { hi: 'hi!' } })
-  expect(i18n.getLocaleMessage('en')).toEqual({ hi: { hi: 'hi!' } })
-
-  i18n.mergeLocaleMessage('en', { hi: { hello: 'hello!' } })
-  expect(i18n.getLocaleMessage('en')).toEqual({
-    hi: {
-      hi: 'hi!',
-      hello: 'hello!'
-    }
-  })
-})
-
-test('d', () => {
-  const i18n = createVueI18n({
-    locale: 'en-US',
-    fallbackLocale: 'ja-JP',
-    datetimeFormats: {
-      'en-US': {
-        short: {
-          year: 'numeric',
-          month: '2-digit',
-          day: '2-digit',
-          hour: '2-digit',
-          minute: '2-digit',
-          timeZone: 'America/New_York'
-        }
-      },
-      'ja-JP': {
-        long: {
-          year: 'numeric',
-          month: '2-digit',
-          day: '2-digit',
-          hour: '2-digit',
-          minute: '2-digit',
-          second: '2-digit',
-          timeZone: 'Asia/Tokyo'
-        },
-        short: {
-          year: 'numeric',
-          month: '2-digit',
-          day: '2-digit',
-          hour: '2-digit',
-          minute: '2-digit',
-          timeZone: 'Asia/Tokyo'
-        }
-      }
-    }
-  })
-  const dt = new Date(Date.UTC(2012, 11, 20, 3, 0, 0))
-  expect(i18n.d(dt, 'short', 'ja-JP')).toEqual('2012/12/20 12:00')
-})
-
-test('n', () => {
-  const i18n = createVueI18n({
-    locale: 'en-US',
-    fallbackLocale: 'ja-JP',
-    numberFormats: {
-      'en-US': {
-        currency: {
-          style: 'currency',
-          currency: 'USD',
-          currencyDisplay: 'symbol'
-        },
-        decimal: {
-          style: 'decimal',
-          useGrouping: false
-        }
-      },
-      'ja-JP': {
-        currency: {
-          style: 'currency',
-          currency: 'JPY' /*, currencyDisplay: 'symbol'*/
-        },
-        numeric: {
-          style: 'decimal',
-          useGrouping: false
-        },
-        percent: {
-          style: 'percent',
-          useGrouping: false
-        }
-      }
-    }
-  })
-  expect(i18n.n(0.99, 'percent', 'ja-JP')).toEqual('99%')
-})
-
-test('getDateTimeFormat / setDateTimeFormat / mergeDateTimeFormat', () => {
-  const i18n = createVueI18n({
-    datetimeFormats: {
-      'en-US': {
-        short: {
-          year: 'numeric',
-          month: '2-digit',
-          day: '2-digit',
-          hour: '2-digit',
-          minute: '2-digit'
-        }
-      }
-    }
-  })
-  expect(i18n.getDateTimeFormat('en-US')).toEqual({
-    short: {
-      year: 'numeric',
-      month: '2-digit',
-      day: '2-digit',
-      hour: '2-digit',
-      minute: '2-digit'
-    }
-  })
-
-  i18n.setDateTimeFormat<{
-    long: {
-      year: string
-      month: string
-      day: string
-      hour: string
-      minute: string
-      second: string
-    }
-  }>('en-US', {
-    long: {
-      year: 'numeric',
-      month: '2-digit',
-      day: '2-digit',
-      hour: '2-digit',
-      minute: '2-digit',
-      second: '2-digit'
-    }
-  })
-  expect(i18n.getDateTimeFormat('en-US')).toEqual({
-    long: {
-      year: 'numeric',
-      month: '2-digit',
-      day: '2-digit',
-      hour: '2-digit',
-      minute: '2-digit',
-      second: '2-digit'
-    }
-  })
-
-  i18n.mergeDateTimeFormat('en-US', {
-    short: {
-      year: 'numeric',
-      month: '2-digit',
-      day: '2-digit',
-      hour: '2-digit',
-      minute: '2-digit'
-    }
-  })
-  expect(i18n.getDateTimeFormat('en-US')).toEqual({
-    short: {
-      year: 'numeric',
-      month: '2-digit',
-      day: '2-digit',
-      hour: '2-digit',
-      minute: '2-digit'
-    },
-    long: {
-      year: 'numeric',
-      month: '2-digit',
-      day: '2-digit',
-      hour: '2-digit',
-      minute: '2-digit',
-      second: '2-digit'
-    }
-  })
-})
-
-test('getNumberFormat / setNumberFormat / mergeNumberFormat', () => {
-  const i18n = createVueI18n({
-    numberFormats: {
-      'en-US': {
-        currency: {
-          style: 'currency',
-          currency: 'USD',
-          currencyDisplay: 'symbol'
-        }
-      }
-    }
-  })
-  expect(i18n.getNumberFormat('en-US')).toEqual({
-    currency: {
-      style: 'currency',
-      currency: 'USD',
-      currencyDisplay: 'symbol'
-    }
-  })
-
-  i18n.setNumberFormat<{ decimal: { style: string; useGrouping: boolean } }>(
-    'en-US',
-    {
-      decimal: {
-        style: 'decimal',
-        useGrouping: false
-      }
-    }
-  )
-  expect(i18n.getNumberFormat('en-US')).toEqual({
-    decimal: {
-      style: 'decimal',
-      useGrouping: false
-    }
-  })
-
-  i18n.mergeNumberFormat('en-US', {
-    currency: {
-      style: 'currency',
-      currency: 'USD',
-      currencyDisplay: 'symbol'
-    }
-  })
-  expect(i18n.getNumberFormat('en-US')).toEqual({
-    currency: {
-      style: 'currency',
-      currency: 'USD',
-      currencyDisplay: 'symbol'
-    },
-    decimal: {
-      style: 'decimal',
-      useGrouping: false
-    }
-  })
-})
-
-test('warnHtmlInMessage', () => {
-  const mockWarn = vi.spyOn(shared, 'warn')
-  mockWarn.mockImplementation(() => {})
-
-  const i18n = createVueI18n({
-    locale: 'en',
-    messages: {
-      en: {
-        hello: '<p>hello</p>'
-      }
-    }
-  })
-
-  expect(i18n.t('hello')).toEqual('<p>hello</p>')
-
-  i18n.warnHtmlInMessage = 'off'
-  expect(i18n.t('hello')).toEqual('<p>hello</p>')
-
-  i18n.warnHtmlInMessage = 'error'
-  expect(i18n.t('hello')).toEqual('<p>hello</p>')
-  expect(mockWarn).toHaveBeenCalledTimes(2)
-})
-
-test('messageResolver', () => {
-  const mockMessageResolver = vi.fn()
-  mockMessageResolver.mockImplementation(
-    (obj: unknown, path: Path): PathValue => {
-      return path
-    }
-  )
-
-  const i18n = createVueI18n({
-    locale: 'en',
-    messageResolver: mockMessageResolver,
-    messages: {
-      en: {}
-    }
-  })
-
-  expect(i18n.t('path.to.message')).toEqual('path.to.message')
-  expect(mockMessageResolver).toHaveBeenCalledTimes(1)
-  expect(mockMessageResolver.mock.calls[0][0]).toEqual({})
-  expect(mockMessageResolver.mock.calls[0][1]).toEqual('path.to.message')
-})
-
-/* eslint-enable @typescript-eslint/no-empty-function */
diff --git a/packages/vue-i18n/src/index.ts b/packages/vue-i18n/src/index.ts
index 409f75fc1..7aa2507e0 100644
--- a/packages/vue-i18n/src/index.ts
+++ b/packages/vue-i18n/src/index.ts
@@ -63,7 +63,6 @@ export {
 } from '@intlify/vue-i18n-core'
 export type {
   BaseFormatProps,
-  Choice,
   ComponentI18nScope,
   Composer,
   ComposerAdditionalOptions,
@@ -78,7 +77,6 @@ export type {
   CustomBlocks,
   DatetimeFormat,
   DatetimeFormatProps,
-  DateTimeFormatResult,
   DefaultDateTimeFormatSchema,
   DefaultLocaleMessageSchema,
   DefaultNumberFormatSchema,
@@ -96,26 +94,14 @@ export type {
   I18nPluginOptions,
   I18nScope,
   I18nT,
-  LocaleMessageObject,
   MissingHandler,
   NumberFormat,
   NumberFormatProps,
-  NumberFormatResult,
-  PluralizationRulesMap,
-  TranslateResult,
   Translation,
   TranslationProps,
   UseI18nOptions,
-  VueI18n,
-  VueI18nDateTimeFormatting,
-  VueI18nExtender,
   VueI18nInstance,
-  VueI18nNumberFormatting,
-  VueI18nOptions,
-  VueI18nResolveLocaleMessageTranslation,
-  VueI18nTranslation,
-  VueMessageType,
-  WarnHtmlInMessageLevel
+  VueMessageType
 } from '@intlify/vue-i18n-core'
 
 export type {
diff --git a/packages/vue-i18n/src/runtime.ts b/packages/vue-i18n/src/runtime.ts
index 72664e491..a742ea098 100644
--- a/packages/vue-i18n/src/runtime.ts
+++ b/packages/vue-i18n/src/runtime.ts
@@ -62,7 +62,6 @@ export {
 } from '@intlify/vue-i18n-core'
 export type {
   BaseFormatProps,
-  Choice,
   ComponentI18nScope,
   Composer,
   ComposerAdditionalOptions,
@@ -77,7 +76,6 @@ export type {
   CustomBlocks,
   DatetimeFormat,
   DatetimeFormatProps,
-  DateTimeFormatResult,
   DefaultDateTimeFormatSchema,
   DefaultLocaleMessageSchema,
   DefaultNumberFormatSchema,
@@ -95,25 +93,13 @@ export type {
   I18nPluginOptions,
   I18nScope,
   I18nT,
-  LocaleMessageObject,
   MissingHandler,
   NumberFormat,
   NumberFormatProps,
-  NumberFormatResult,
-  PluralizationRulesMap,
-  TranslateResult,
   Translation,
   TranslationProps,
   UseI18nOptions,
-  VueI18n,
-  VueI18nDateTimeFormatting,
-  VueI18nExtender,
-  VueI18nNumberFormatting,
-  VueI18nOptions,
-  VueI18nResolveLocaleMessageTranslation,
-  VueI18nTranslation,
-  VueMessageType,
-  WarnHtmlInMessageLevel
+  VueMessageType
 } from '@intlify/vue-i18n-core'
 
 export type {

From 3c1488c5db1a2310ed87f6c85196ffabc7f77fab Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 18:17:33 +0900
Subject: [PATCH 07/18] fix others

---
 e2e/fallback/basic.spec.ts          | 5 +----
 e2e/fallback/default-format.spec.ts | 5 +----
 e2e/fallback/format.spec.ts         | 5 +----
 e2e/fallback/option.spec.ts         | 5 +----
 e2e/fallback/suppress.spec.ts       | 5 +----
 e2e/missing/handler.spec.ts         | 5 +----
 e2e/missing/option.spec.ts          | 5 +----
 e2e/missing/suppress.spec.ts        | 5 +----
 8 files changed, 8 insertions(+), 32 deletions(-)

diff --git a/e2e/fallback/basic.spec.ts b/e2e/fallback/basic.spec.ts
index 49757631c..bed9ef0e4 100644
--- a/e2e/fallback/basic.spec.ts
+++ b/e2e/fallback/basic.spec.ts
@@ -6,10 +6,7 @@ import { getText, url } from '../helper'
       page.on('console', msg => {
         if (msg.type() === 'warning') {
           const text = msg.text()
-          if (
-            !text.match(/^\[intlify\] Legacy API mode has been/) &&
-            !text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)
-          ) {
+          if (!text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)) {
             warnings.push(msg.text())
           }
         }
diff --git a/e2e/fallback/default-format.spec.ts b/e2e/fallback/default-format.spec.ts
index 35bdb9a73..f30ea86de 100644
--- a/e2e/fallback/default-format.spec.ts
+++ b/e2e/fallback/default-format.spec.ts
@@ -6,10 +6,7 @@ import { getText, url } from '../helper'
       page.on('console', msg => {
         if (msg.type() === 'warning') {
           const text = msg.text()
-          if (
-            !text.match(/^\[intlify\] Legacy API mode has been/) &&
-            !text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)
-          ) {
+          if (!text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)) {
             warnings.push(msg.text())
           }
         }
diff --git a/e2e/fallback/format.spec.ts b/e2e/fallback/format.spec.ts
index 40e18f49b..38ca9fca1 100644
--- a/e2e/fallback/format.spec.ts
+++ b/e2e/fallback/format.spec.ts
@@ -6,10 +6,7 @@ import { getText, url } from '../helper'
       page.on('console', msg => {
         if (msg.type() === 'warning') {
           const text = msg.text()
-          if (
-            !text.match(/^\[intlify\] Legacy API mode has been/) &&
-            !text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)
-          ) {
+          if (!text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)) {
             warnings.push(msg.text())
           }
         }
diff --git a/e2e/fallback/option.spec.ts b/e2e/fallback/option.spec.ts
index f3f42b85b..6021f2a1e 100644
--- a/e2e/fallback/option.spec.ts
+++ b/e2e/fallback/option.spec.ts
@@ -6,10 +6,7 @@ import { getText, url } from '../helper'
       page.on('console', msg => {
         if (msg.type() === 'warning') {
           const text = msg.text()
-          if (
-            !text.match(/^\[intlify\] Legacy API mode has been/) &&
-            !text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)
-          ) {
+          if (!text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)) {
             warnings.push(msg.text())
           }
         }
diff --git a/e2e/fallback/suppress.spec.ts b/e2e/fallback/suppress.spec.ts
index 11b2482e9..fe9029bf3 100644
--- a/e2e/fallback/suppress.spec.ts
+++ b/e2e/fallback/suppress.spec.ts
@@ -6,10 +6,7 @@ import { getText, url } from '../helper'
       page.on('console', msg => {
         if (msg.type() === 'warning') {
           const text = msg.text()
-          if (
-            !text.match(/^\[intlify\] Legacy API mode has been/) &&
-            !text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)
-          ) {
+          if (!text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)) {
             warnings.push(msg.text())
           }
         }
diff --git a/e2e/missing/handler.spec.ts b/e2e/missing/handler.spec.ts
index 579b961b9..68b42028c 100644
--- a/e2e/missing/handler.spec.ts
+++ b/e2e/missing/handler.spec.ts
@@ -6,10 +6,7 @@ import { getText, url } from '../helper'
       page.on('console', msg => {
         if (msg.type() === 'warning') {
           const text = msg.text()
-          if (
-            !text.match(/^\[intlify\] Legacy API mode has been/) &&
-            !text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)
-          ) {
+          if (!text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)) {
             warnings.push(msg.text())
           }
         }
diff --git a/e2e/missing/option.spec.ts b/e2e/missing/option.spec.ts
index b0f234f0f..0d5df96d2 100644
--- a/e2e/missing/option.spec.ts
+++ b/e2e/missing/option.spec.ts
@@ -6,10 +6,7 @@ import { getText, url } from '../helper'
       page.on('console', msg => {
         if (msg.type() === 'warning') {
           const text = msg.text()
-          if (
-            !text.match(/^\[intlify\] Legacy API mode has been/) &&
-            !text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)
-          ) {
+          if (!text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)) {
             warnings.push(msg.text())
           }
         }
diff --git a/e2e/missing/suppress.spec.ts b/e2e/missing/suppress.spec.ts
index d3201c499..29291a77b 100644
--- a/e2e/missing/suppress.spec.ts
+++ b/e2e/missing/suppress.spec.ts
@@ -6,10 +6,7 @@ import { getText, url } from '../helper'
       page.on('console', msg => {
         if (msg.type() === 'warning') {
           const text = msg.text()
-          if (
-            !text.match(/^\[intlify\] Legacy API mode has been/) &&
-            !text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)
-          ) {
+          if (!text.match(/^\[intlify\] 'v-t' has been deprecated in v11/)) {
             warnings.push(msg.text())
           }
         }

From 25245cea6d509a626fd3f8278024213a2faccba7 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 18:46:14 +0900
Subject: [PATCH 08/18] remove mode

---
 packages/vue-i18n-core/src/i18n.ts | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/packages/vue-i18n-core/src/i18n.ts b/packages/vue-i18n-core/src/i18n.ts
index 599c11d1f..f73970c06 100644
--- a/packages/vue-i18n-core/src/i18n.ts
+++ b/packages/vue-i18n-core/src/i18n.ts
@@ -383,10 +383,6 @@ export function createI18n(options: any = {}): any {
   }
 
   const i18n = {
-    // mode
-    get mode() {
-      return 'composition'
-    },
     // install plugin
     async install(app: App, ...options: unknown[]): Promise<void> {
       if ((__DEV__ || __FEATURE_PROD_VUE_DEVTOOLS__) && !__NODE_JS__) {

From cf28db989eb6391f9dea975ca273698b9bee7eb0 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 19:18:29 +0900
Subject: [PATCH 09/18] fix others

---
 benchmark/complex-jit-aot.mjs                        |  1 -
 benchmark/complex-jit.mjs                            |  1 -
 benchmark/complex.mjs                                |  1 -
 benchmark/simple-jit-aot.mjs                         |  1 -
 benchmark/simple-jit.mjs                             |  1 -
 benchmark/simple.mjs                                 |  1 -
 e2e/hotfix/CVE-2024-52809.html                       |  1 -
 examples/backend/src/main.ts                         |  1 -
 examples/composition/components/datetime-format.html |  1 -
 examples/composition/components/number-format.html   |  1 -
 examples/composition/components/translation.html     |  1 -
 examples/composition/datetime.html                   |  1 -
 examples/composition/fallback/basic.html             |  1 -
 examples/composition/fallback/component.html         |  1 -
 examples/composition/fallback/default-format.html    |  1 -
 examples/composition/fallback/format.html            |  1 -
 examples/composition/fallback/option.html            |  1 -
 examples/composition/fallback/suppress.html          |  1 -
 examples/composition/formatting/linked.html          |  1 -
 examples/composition/formatting/list.html            |  1 -
 examples/composition/formatting/literal.html         |  1 -
 examples/composition/formatting/named.html           |  1 -
 examples/composition/functions/linked.html           |  1 -
 examples/composition/functions/list.html             |  1 -
 examples/composition/functions/named.html            |  1 -
 examples/composition/functions/plural.html           |  1 -
 examples/composition/missing/handler.html            |  1 -
 examples/composition/missing/option.html             |  1 -
 examples/composition/missing/suppress.html           |  1 -
 examples/composition/number.html                     |  1 -
 examples/composition/plural/basic.html               |  1 -
 examples/composition/plural/custom.html              |  1 -
 examples/composition/scope/global.html               |  1 -
 examples/composition/scope/inherit-locale.html       |  1 -
 examples/composition/scope/local.html                |  1 -
 examples/composition/started.html                    |  1 -
 examples/frameworks/nuxt3/plugins/i18n.ts            |  1 -
 examples/lazy-loading/vite/src/main.ts               |  1 -
 examples/lazy-loading/webpack/src/main.js            |  1 -
 examples/message-format/src/main.ts                  |  1 -
 examples/petite/plural/basic.html                    |  1 -
 examples/petite/plural/custom.html                   |  1 -
 examples/ssr/vite/src/i18n.js                        |  1 -
 examples/ssr/vitepress/.vitepress/theme/index.ts     |  1 -
 examples/tsx/src/main.ts                             |  1 -
 .../type-safe/global-type-definition/src/main.ts     |  1 -
 examples/type-safe/type-annotation/src/main.ts       |  1 -
 .../web-components/src/components/I18nHost.ce.vue    |  1 -
 examples/web-components/src/main.ts                  |  1 -
 packages/vue-i18n-core/src/composer.ts               |  2 --
 packages/vue-i18n-core/src/errors.ts                 | 12 ++----------
 .../test/components/Translation.test.ts              |  5 -----
 packages/vue-i18n-core/test/errors.test.ts           |  2 +-
 packages/vue-i18n-core/test/ssr.test.ts              |  2 --
 54 files changed, 3 insertions(+), 69 deletions(-)

diff --git a/benchmark/complex-jit-aot.mjs b/benchmark/complex-jit-aot.mjs
index c1ed84488..da5613661 100644
--- a/benchmark/complex-jit-aot.mjs
+++ b/benchmark/complex-jit-aot.mjs
@@ -45,7 +45,6 @@ const ctx = createCoreContext({
 })
 
 const i18n = createI18n({
-  legacy: false,
   locale: 'en',
   modifiers: {
     caml: val => val
diff --git a/benchmark/complex-jit.mjs b/benchmark/complex-jit.mjs
index 154e9482e..de0d333a8 100644
--- a/benchmark/complex-jit.mjs
+++ b/benchmark/complex-jit.mjs
@@ -34,7 +34,6 @@ const ctx = createCoreContext({
 })
 
 const i18n = createI18n({
-  legacy: false,
   locale: 'en',
   modifiers: {
     caml: val => val
diff --git a/benchmark/complex.mjs b/benchmark/complex.mjs
index 5fa7aad19..55cc9b3b7 100644
--- a/benchmark/complex.mjs
+++ b/benchmark/complex.mjs
@@ -28,7 +28,6 @@ const ctx = createCoreContext({
 })
 
 const i18n = createI18n({
-  legacy: false,
   locale: 'en',
   modifiers: {
     caml: val => val
diff --git a/benchmark/simple-jit-aot.mjs b/benchmark/simple-jit-aot.mjs
index dcb91affa..6b0392286 100644
--- a/benchmark/simple-jit-aot.mjs
+++ b/benchmark/simple-jit-aot.mjs
@@ -40,7 +40,6 @@ const ctx = createCoreContext({
 })
 
 const i18n = createI18n({
-  legacy: false,
   locale: 'en',
   messages: {
     en: precompiledResources
diff --git a/benchmark/simple-jit.mjs b/benchmark/simple-jit.mjs
index 3bac413b8..61b8522c2 100644
--- a/benchmark/simple-jit.mjs
+++ b/benchmark/simple-jit.mjs
@@ -29,7 +29,6 @@ const ctx = createCoreContext({
 })
 
 const i18n = createI18n({
-  legacy: false,
   locale: 'en',
   messages: {
     en: resources
diff --git a/benchmark/simple.mjs b/benchmark/simple.mjs
index fe9874547..246206e68 100644
--- a/benchmark/simple.mjs
+++ b/benchmark/simple.mjs
@@ -23,7 +23,6 @@ const ctx = createCoreContext({
 })
 
 const i18n = createI18n({
-  legacy: false,
   locale: 'en',
   messages: {
     en: resources
diff --git a/e2e/hotfix/CVE-2024-52809.html b/e2e/hotfix/CVE-2024-52809.html
index c2e6c3cbf..2a5c043e9 100644
--- a/e2e/hotfix/CVE-2024-52809.html
+++ b/e2e/hotfix/CVE-2024-52809.html
@@ -49,7 +49,6 @@
       }
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'en',
         messages: {
           en
diff --git a/examples/backend/src/main.ts b/examples/backend/src/main.ts
index cb40f41cd..443cacbf9 100644
--- a/examples/backend/src/main.ts
+++ b/examples/backend/src/main.ts
@@ -12,7 +12,6 @@ const messages = await load<Locales>(locales)
 
 // create i18n instance
 const i18n = createI18n<[ResourceSchema], Locales, false>({
-  legacy: false,
   locale: 'en',
   messages
 })
diff --git a/examples/composition/components/datetime-format.html b/examples/composition/components/datetime-format.html
index 48521377e..47c840ba6 100644
--- a/examples/composition/components/datetime-format.html
+++ b/examples/composition/components/datetime-format.html
@@ -39,7 +39,6 @@ <h2>slot usages:</h2>
       const { createI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'en-US',
         datetimeFormats: {
           'en-US': {
diff --git a/examples/composition/components/number-format.html b/examples/composition/components/number-format.html
index d09e9668a..cb8db41ea 100644
--- a/examples/composition/components/number-format.html
+++ b/examples/composition/components/number-format.html
@@ -47,7 +47,6 @@ <h2>slot usages:</h2>
       const { createI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'en-US',
         numberFormats: {
           'en-US': {
diff --git a/examples/composition/components/translation.html b/examples/composition/components/translation.html
index e2d97578d..88a5d01dc 100644
--- a/examples/composition/components/translation.html
+++ b/examples/composition/components/translation.html
@@ -59,7 +59,6 @@ <h2>localize with using plural:</h2>
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         messages: {
           en: {
diff --git a/examples/composition/datetime.html b/examples/composition/datetime.html
index 9a6e63753..4f02e0fe4 100644
--- a/examples/composition/datetime.html
+++ b/examples/composition/datetime.html
@@ -23,7 +23,6 @@ <h1>DateTime Localization for Composition API</h1>
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja-JP',
         messages: {
           'en-US': {
diff --git a/examples/composition/fallback/basic.html b/examples/composition/fallback/basic.html
index a8310e795..ae3017148 100644
--- a/examples/composition/fallback/basic.html
+++ b/examples/composition/fallback/basic.html
@@ -15,7 +15,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         fallbackLocale: ['en'],
         messages: {
diff --git a/examples/composition/fallback/component.html b/examples/composition/fallback/component.html
index db2d6879f..c2820145e 100644
--- a/examples/composition/fallback/component.html
+++ b/examples/composition/fallback/component.html
@@ -25,7 +25,6 @@ <h1>Root</h1>
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         messages: {
           en: {
diff --git a/examples/composition/fallback/default-format.html b/examples/composition/fallback/default-format.html
index 243708fd2..66b06df03 100644
--- a/examples/composition/fallback/default-format.html
+++ b/examples/composition/fallback/default-format.html
@@ -27,7 +27,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         fallbackLocale: ['en'],
         messages: {
diff --git a/examples/composition/fallback/format.html b/examples/composition/fallback/format.html
index 820bd7447..5d10a7db8 100644
--- a/examples/composition/fallback/format.html
+++ b/examples/composition/fallback/format.html
@@ -15,7 +15,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         fallbackFormat: true, // enable, fallback to locale message key
         messages: {
diff --git a/examples/composition/fallback/option.html b/examples/composition/fallback/option.html
index 303987b53..62e083da4 100644
--- a/examples/composition/fallback/option.html
+++ b/examples/composition/fallback/option.html
@@ -18,7 +18,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         fallbackLocale: ['en'],
         messages: {
diff --git a/examples/composition/fallback/suppress.html b/examples/composition/fallback/suppress.html
index 3e3d08b40..ac4ac3858 100644
--- a/examples/composition/fallback/suppress.html
+++ b/examples/composition/fallback/suppress.html
@@ -15,7 +15,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         fallbackLocale: ['en'],
         fallbackWarn: false, // warning off
diff --git a/examples/composition/formatting/linked.html b/examples/composition/formatting/linked.html
index 73c3b657a..af981fb50 100644
--- a/examples/composition/formatting/linked.html
+++ b/examples/composition/formatting/linked.html
@@ -27,7 +27,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'en',
         messages: {
           en: {
diff --git a/examples/composition/formatting/list.html b/examples/composition/formatting/list.html
index 6cba3469f..74fb77741 100644
--- a/examples/composition/formatting/list.html
+++ b/examples/composition/formatting/list.html
@@ -22,7 +22,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         messages: {
           en: {
diff --git a/examples/composition/formatting/literal.html b/examples/composition/formatting/literal.html
index 86ce30eec..fddb3e08a 100644
--- a/examples/composition/formatting/literal.html
+++ b/examples/composition/formatting/literal.html
@@ -22,7 +22,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         messages: {
           en: {
diff --git a/examples/composition/formatting/named.html b/examples/composition/formatting/named.html
index 34114fa99..3f24f693e 100644
--- a/examples/composition/formatting/named.html
+++ b/examples/composition/formatting/named.html
@@ -22,7 +22,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         messages: {
           en: {
diff --git a/examples/composition/functions/linked.html b/examples/composition/functions/linked.html
index c61797d22..92edbd7f9 100644
--- a/examples/composition/functions/linked.html
+++ b/examples/composition/functions/linked.html
@@ -27,7 +27,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'en',
         messages: {
           en: {
diff --git a/examples/composition/functions/list.html b/examples/composition/functions/list.html
index f2176d649..e3044d991 100644
--- a/examples/composition/functions/list.html
+++ b/examples/composition/functions/list.html
@@ -22,7 +22,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         messages: {
           en: {
diff --git a/examples/composition/functions/named.html b/examples/composition/functions/named.html
index 7d8752421..12b44bf8e 100644
--- a/examples/composition/functions/named.html
+++ b/examples/composition/functions/named.html
@@ -22,7 +22,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         messages: {
           en: {
diff --git a/examples/composition/functions/plural.html b/examples/composition/functions/plural.html
index b13d11603..149e78a3d 100644
--- a/examples/composition/functions/plural.html
+++ b/examples/composition/functions/plural.html
@@ -26,7 +26,6 @@ <h2>Banana:</h2>
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'en',
         messages: {
           en: {
diff --git a/examples/composition/missing/handler.html b/examples/composition/missing/handler.html
index 8e1cfb3d7..b785c39e4 100644
--- a/examples/composition/missing/handler.html
+++ b/examples/composition/missing/handler.html
@@ -15,7 +15,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         fallbackLocale: ['en'],
         missing: (locale, key, instance) => {
diff --git a/examples/composition/missing/option.html b/examples/composition/missing/option.html
index 19f8bf404..cbd53fb15 100644
--- a/examples/composition/missing/option.html
+++ b/examples/composition/missing/option.html
@@ -18,7 +18,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         fallbackLocale: ['en'],
         messages: {
diff --git a/examples/composition/missing/suppress.html b/examples/composition/missing/suppress.html
index 63112f9cd..dc659cc81 100644
--- a/examples/composition/missing/suppress.html
+++ b/examples/composition/missing/suppress.html
@@ -15,7 +15,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         fallbackLocale: ['en'],
         missingWarn: false, // warning off
diff --git a/examples/composition/number.html b/examples/composition/number.html
index c475def1d..d3637ecf6 100644
--- a/examples/composition/number.html
+++ b/examples/composition/number.html
@@ -31,7 +31,6 @@ <h1>Number Localization for Composition API</h1>
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja-JP',
         messages: {
           'en-US': {
diff --git a/examples/composition/plural/basic.html b/examples/composition/plural/basic.html
index 7a7ac5c07..793eec5c4 100644
--- a/examples/composition/plural/basic.html
+++ b/examples/composition/plural/basic.html
@@ -26,7 +26,6 @@ <h2>Banana:</h2>
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'en',
         messages: {
           en: {
diff --git a/examples/composition/plural/custom.html b/examples/composition/plural/custom.html
index b7cabab60..b01e29b6a 100644
--- a/examples/composition/plural/custom.html
+++ b/examples/composition/plural/custom.html
@@ -43,7 +43,6 @@ <h2>Banana:</h2>
       }
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ru',
         pluralRules: {
           ru: customRule
diff --git a/examples/composition/scope/global.html b/examples/composition/scope/global.html
index b0ceb754c..a82113f3b 100644
--- a/examples/composition/scope/global.html
+++ b/examples/composition/scope/global.html
@@ -75,7 +75,6 @@ <h1>Child</h1>
       }
 
       const i18n = createI18n({
-        legacy: false,
         globalInjection: true,
         locale: 'ja',
         messages: {
diff --git a/examples/composition/scope/inherit-locale.html b/examples/composition/scope/inherit-locale.html
index 75ad7ac0b..aaa34b5dd 100644
--- a/examples/composition/scope/inherit-locale.html
+++ b/examples/composition/scope/inherit-locale.html
@@ -66,7 +66,6 @@ <h1>Child</h1>
       }
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         messages: {
           en: {
diff --git a/examples/composition/scope/local.html b/examples/composition/scope/local.html
index 2376a1bf9..39fe728d9 100644
--- a/examples/composition/scope/local.html
+++ b/examples/composition/scope/local.html
@@ -63,7 +63,6 @@ <h1>Child</h1>
       }
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         messages: {
           en: {
diff --git a/examples/composition/started.html b/examples/composition/started.html
index 154f2c3f2..bf5ee444b 100644
--- a/examples/composition/started.html
+++ b/examples/composition/started.html
@@ -22,7 +22,6 @@
       const { createI18n, useI18n } = VueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ja',
         messages: {
           en: {
diff --git a/examples/frameworks/nuxt3/plugins/i18n.ts b/examples/frameworks/nuxt3/plugins/i18n.ts
index 05cb3eea4..b3fb3e892 100644
--- a/examples/frameworks/nuxt3/plugins/i18n.ts
+++ b/examples/frameworks/nuxt3/plugins/i18n.ts
@@ -5,7 +5,6 @@ import ja from '../locales/ja.json'
 
 export default defineNuxtPlugin(({ vueApp }) => {
   const i18n = createI18n({
-    legacy: false,
     globalInjection: true,
     locale: 'en',
     messages: {
diff --git a/examples/lazy-loading/vite/src/main.ts b/examples/lazy-loading/vite/src/main.ts
index b308cbc6f..606e77905 100644
--- a/examples/lazy-loading/vite/src/main.ts
+++ b/examples/lazy-loading/vite/src/main.ts
@@ -6,7 +6,6 @@ import { setupI18n } from './i18n'
 import en from './locales/en.json'
 
 const i18n = setupI18n({
-  legacy: false,
   locale: 'en',
   fallbackLocale: 'en',
   messages: {
diff --git a/examples/lazy-loading/webpack/src/main.js b/examples/lazy-loading/webpack/src/main.js
index 882654807..85e478a9e 100644
--- a/examples/lazy-loading/webpack/src/main.js
+++ b/examples/lazy-loading/webpack/src/main.js
@@ -7,7 +7,6 @@ import en from './locales/en.json'
 
 const i18n = setupI18n({
   globalInjection: true,
-  legacy: false,
   locale: 'en',
   fallbackLocale: 'en',
   messages: {
diff --git a/examples/message-format/src/main.ts b/examples/message-format/src/main.ts
index adf5777c3..8ce03b417 100644
--- a/examples/message-format/src/main.ts
+++ b/examples/message-format/src/main.ts
@@ -6,7 +6,6 @@ import App from './App.vue'
 import { messageCompiler } from './compilation'
 
 const i18n = createI18n({
-  legacy: false,
   locale: 'en',
   messageCompiler,
   messages: {
diff --git a/examples/petite/plural/basic.html b/examples/petite/plural/basic.html
index 2bb6fe274..caa0d4c7f 100644
--- a/examples/petite/plural/basic.html
+++ b/examples/petite/plural/basic.html
@@ -26,7 +26,6 @@ <h2>Banana:</h2>
       const { createI18n, useI18n } = PetiteVueI18n
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'en',
         messages: {
           en: {
diff --git a/examples/petite/plural/custom.html b/examples/petite/plural/custom.html
index 34d54f601..6aea11f83 100644
--- a/examples/petite/plural/custom.html
+++ b/examples/petite/plural/custom.html
@@ -43,7 +43,6 @@ <h2>Banana:</h2>
       }
 
       const i18n = createI18n({
-        legacy: false,
         locale: 'ru',
         pluralRules: {
           ru: customRule
diff --git a/examples/ssr/vite/src/i18n.js b/examples/ssr/vite/src/i18n.js
index 9fd13a3d1..9578bf128 100644
--- a/examples/ssr/vite/src/i18n.js
+++ b/examples/ssr/vite/src/i18n.js
@@ -9,7 +9,6 @@ export const SUPPORT_LOCALES = ['en', 'ja']
 
 export function createI18n() {
   return _createI18n({
-    legacy: false,
     globalInjection: true,
     locale: 'ja',
     fallbackLocale: 'en',
diff --git a/examples/ssr/vitepress/.vitepress/theme/index.ts b/examples/ssr/vitepress/.vitepress/theme/index.ts
index 5a65bd145..d4fdf0730 100644
--- a/examples/ssr/vitepress/.vitepress/theme/index.ts
+++ b/examples/ssr/vitepress/.vitepress/theme/index.ts
@@ -5,7 +5,6 @@ export default {
   extends: DefaultTheme,
   enhanceApp({ app, router, siteData }) {
     const i18n = createI18n({
-      legacy: false,
       locale: 'en',
       messages: {
         en: {
diff --git a/examples/tsx/src/main.ts b/examples/tsx/src/main.ts
index 4b68c8fd2..a1c3cd0e2 100644
--- a/examples/tsx/src/main.ts
+++ b/examples/tsx/src/main.ts
@@ -3,7 +3,6 @@ import { createI18n } from 'vue-i18n'
 import App from './App.vue'
 
 const i18n = createI18n({
-  legacy: false,
   locale: 'en',
   messages: {
     en: {
diff --git a/examples/type-safe/global-type-definition/src/main.ts b/examples/type-safe/global-type-definition/src/main.ts
index d44ffacc5..03c88c9d9 100644
--- a/examples/type-safe/global-type-definition/src/main.ts
+++ b/examples/type-safe/global-type-definition/src/main.ts
@@ -14,7 +14,6 @@ import jaJP from './locales/ja-JP.json'
  * you can check global type defition at `./vue-i18n.d.ts`
  */
 const i18n = createI18n<false>({
-  legacy: false,
   locale: 'ja-JP',
   fallbackLocale: 'en-US',
   messages: {
diff --git a/examples/type-safe/type-annotation/src/main.ts b/examples/type-safe/type-annotation/src/main.ts
index 4abc52dd0..3bc436020 100644
--- a/examples/type-safe/type-annotation/src/main.ts
+++ b/examples/type-safe/type-annotation/src/main.ts
@@ -20,7 +20,6 @@ const i18n = createI18n<
   false
 >({
   locale: 'en-US',
-  legacy: false,
   messages: {
     'en-US': enUS
   },
diff --git a/examples/web-components/src/components/I18nHost.ce.vue b/examples/web-components/src/components/I18nHost.ce.vue
index 5f1ea5122..69e486cc7 100644
--- a/examples/web-components/src/components/I18nHost.ce.vue
+++ b/examples/web-components/src/components/I18nHost.ce.vue
@@ -19,7 +19,6 @@ import { createI18n, I18nInjectionKey } from 'vue-i18n'
  *  It will not work in legacy API mode.
  */
 const i18n = createI18n<false>({
-  legacy: false, // must set to `false`
   locale: 'en',
   messages: {
     en: {
diff --git a/examples/web-components/src/main.ts b/examples/web-components/src/main.ts
index 826d6a32c..05630216c 100644
--- a/examples/web-components/src/main.ts
+++ b/examples/web-components/src/main.ts
@@ -13,7 +13,6 @@ customElements.define('hello-i18n', HelloI18nElement)
 customElements.define('hello-block', HelloBlockElement)
 
 const i18n = createI18n<false>({
-  legacy: false,
   locale: 'en',
   messages: {}
 })
diff --git a/packages/vue-i18n-core/src/composer.ts b/packages/vue-i18n-core/src/composer.ts
index 7a5c5b8c9..f696e53aa 100644
--- a/packages/vue-i18n-core/src/composer.ts
+++ b/packages/vue-i18n-core/src/composer.ts
@@ -526,7 +526,6 @@ export interface ComposerOptions<
    *
    * // call with I18n option
    * const i18n = createI18n({
-   *   legacy: false,
    *   locale: 'ja',
    *   messageResolver, // set your message resolver
    *   messages: {
@@ -580,7 +579,6 @@ export interface ComposerOptions<
    *
    * // call with I18n option
    * const i18n = createI18n({
-   *   legacy: false,
    *   locale: 'ja',
    *   messageCompiler, // set your message compiler
    *   messages: {
diff --git a/packages/vue-i18n-core/src/errors.ts b/packages/vue-i18n-core/src/errors.ts
index 961d62c9b..51aca94a6 100644
--- a/packages/vue-i18n-core/src/errors.ts
+++ b/packages/vue-i18n-core/src/errors.ts
@@ -22,11 +22,7 @@ export const I18nErrorCodes = {
   CANNOT_SETUP_VUE_DEVTOOLS_PLUGIN: 30,
   NOT_INSTALLED_WITH_PROVIDE: 31,
   // unexpected error
-  UNEXPECTED_ERROR: 32,
-  // not compatible legacy vue-i18n constructor
-  NOT_COMPATIBLE_LEGACY_VUE_I18N: 33,
-  // Not available Compostion API in Legacy API mode. Please make sure that the legacy API mode is working properly
-  NOT_AVAILABLE_COMPOSITION_IN_LEGACY: 34
+  UNEXPECTED_ERROR: 32
 } as const
 
 type I18nErrorCodes = (typeof I18nErrorCodes)[keyof typeof I18nErrorCodes]
@@ -53,9 +49,5 @@ export const errorMessages: { [code: number]: string } = {
   [I18nErrorCodes.INVALID_VALUE]: `Invalid value`,
   [I18nErrorCodes.CANNOT_SETUP_VUE_DEVTOOLS_PLUGIN]: `Cannot setup vue-devtools plugin`,
   [I18nErrorCodes.NOT_INSTALLED_WITH_PROVIDE]:
-    'Need to install with `provide` function',
-  [I18nErrorCodes.NOT_COMPATIBLE_LEGACY_VUE_I18N]:
-    'Not compatible legacy VueI18n.',
-  [I18nErrorCodes.NOT_AVAILABLE_COMPOSITION_IN_LEGACY]:
-    'Not available Compostion API in Legacy API mode. Please make sure that the legacy API mode is working properly'
+    'Need to install with `provide` function'
 }
diff --git a/packages/vue-i18n-core/test/components/Translation.test.ts b/packages/vue-i18n-core/test/components/Translation.test.ts
index 23af1e8f8..d99666464 100644
--- a/packages/vue-i18n-core/test/components/Translation.test.ts
+++ b/packages/vue-i18n-core/test/components/Translation.test.ts
@@ -80,7 +80,6 @@ test('slot contents', async () => {
 
 test('DOM contents', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages
   })
@@ -104,7 +103,6 @@ test('DOM contents', async () => {
 
 test('linked contents', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages
   })
@@ -128,7 +126,6 @@ test('linked contents', async () => {
 
 test('plural contents', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages
   })
@@ -153,7 +150,6 @@ test('plural contents', async () => {
 
 test('scope', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages: {
       en: {
@@ -280,7 +276,6 @@ test('message resolver', async () => {
 
 test('v-if / v-else', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages
   })
diff --git a/packages/vue-i18n-core/test/errors.test.ts b/packages/vue-i18n-core/test/errors.test.ts
index a59b81ce4..46678b062 100644
--- a/packages/vue-i18n-core/test/errors.test.ts
+++ b/packages/vue-i18n-core/test/errors.test.ts
@@ -1,5 +1,5 @@
 import { I18nErrorCodes } from '../src/errors'
 
 test('I18nErrorCodes', () => {
-  expect(I18nErrorCodes.NOT_AVAILABLE_COMPOSITION_IN_LEGACY).toBe(34)
+  expect(I18nErrorCodes.UNEXPECTED_RETURN_TYPE).toBe(24)
 })
diff --git a/packages/vue-i18n-core/test/ssr.test.ts b/packages/vue-i18n-core/test/ssr.test.ts
index 0df8e4477..b945796e6 100644
--- a/packages/vue-i18n-core/test/ssr.test.ts
+++ b/packages/vue-i18n-core/test/ssr.test.ts
@@ -28,7 +28,6 @@ beforeAll(() => {
 
 test('composition mode', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages: {}
   })
@@ -75,7 +74,6 @@ test('legacy mode', async () => {
 
 test('component: i18n-t', async () => {
   const i18n = createI18n({
-    legacy: false,
     locale: 'en',
     messages: {}
   })

From 2d9b537905249d4f2b9d16281216b7424af550a5 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 19:21:20 +0900
Subject: [PATCH 10/18] fix others

---
 examples/type-safe/global-type-definition/src/main.ts | 6 +++---
 examples/web-components/src/main.ts                   | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/examples/type-safe/global-type-definition/src/main.ts b/examples/type-safe/global-type-definition/src/main.ts
index 03c88c9d9..3ad441f88 100644
--- a/examples/type-safe/global-type-definition/src/main.ts
+++ b/examples/type-safe/global-type-definition/src/main.ts
@@ -3,7 +3,7 @@ import { createI18n } from 'vue-i18n'
 import App from './App.vue'
 
 /**
- * import locale messages resoruce from json for global scope
+ * import locale messages resource from json for global scope
  */
 import enUS from './locales/en-US.json'
 import jaJP from './locales/ja-JP.json'
@@ -11,9 +11,9 @@ import jaJP from './locales/ja-JP.json'
 /**
  * setup vue-i18n with i18n resources with global type definition.
  * if you define the i18n resource schema in your `*.d.ts`, these is checked with typeScript.
- * you can check global type defition at `./vue-i18n.d.ts`
+ * you can check global type definition at `./vue-i18n.d.ts`
  */
-const i18n = createI18n<false>({
+const i18n = createI18n({
   locale: 'ja-JP',
   fallbackLocale: 'en-US',
   messages: {
diff --git a/examples/web-components/src/main.ts b/examples/web-components/src/main.ts
index 05630216c..a1320824d 100644
--- a/examples/web-components/src/main.ts
+++ b/examples/web-components/src/main.ts
@@ -12,7 +12,7 @@ customElements.define('i18n-host', I18nHostElement)
 customElements.define('hello-i18n', HelloI18nElement)
 customElements.define('hello-block', HelloBlockElement)
 
-const i18n = createI18n<false>({
+const i18n = createI18n({
   locale: 'en',
   messages: {}
 })

From af2a1d0c9d597a11d31005496f0f198104d298b4 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 19:29:09 +0900
Subject: [PATCH 11/18] fix others

---
 .../global-type-definition/vite.config.ts     |  3 +--
 .../type-safe/type-annotation/vite.config.ts  |  3 +--
 .../size-check-petite-vue-i18n/vite.config.ts |  1 -
 packages/size-check-vue-i18n/vite.config.ts   |  1 -
 packages/vue-i18n-core/src/warnings.ts        | 20 ++-----------------
 5 files changed, 4 insertions(+), 24 deletions(-)

diff --git a/examples/type-safe/global-type-definition/vite.config.ts b/examples/type-safe/global-type-definition/vite.config.ts
index a44776683..58ebd55a0 100644
--- a/examples/type-safe/global-type-definition/vite.config.ts
+++ b/examples/type-safe/global-type-definition/vite.config.ts
@@ -5,7 +5,6 @@ import vue from '@vitejs/plugin-vue'
 export default defineConfig({
   plugins: [vue()],
   define: {
-    __VUE_I18N_FULL_INSTALL__: true,
-    __VUE_I18N_LEGACY_API__: true
+    __VUE_I18N_FULL_INSTALL__: true
   }
 })
diff --git a/examples/type-safe/type-annotation/vite.config.ts b/examples/type-safe/type-annotation/vite.config.ts
index a44776683..58ebd55a0 100644
--- a/examples/type-safe/type-annotation/vite.config.ts
+++ b/examples/type-safe/type-annotation/vite.config.ts
@@ -5,7 +5,6 @@ import vue from '@vitejs/plugin-vue'
 export default defineConfig({
   plugins: [vue()],
   define: {
-    __VUE_I18N_FULL_INSTALL__: true,
-    __VUE_I18N_LEGACY_API__: true
+    __VUE_I18N_FULL_INSTALL__: true
   }
 })
diff --git a/packages/size-check-petite-vue-i18n/vite.config.ts b/packages/size-check-petite-vue-i18n/vite.config.ts
index 953c8b3fa..62b839256 100644
--- a/packages/size-check-petite-vue-i18n/vite.config.ts
+++ b/packages/size-check-petite-vue-i18n/vite.config.ts
@@ -15,7 +15,6 @@ export default defineConfig({
     __RUNTIME__: true,
     // is targeting Node (SSR)?
     __NODE_JS__: false,
-    __VUE_I18N_LEGACY_API__: false,
     __VUE_I18N_FULL_INSTALL__: false,
     __VUE_PROD_DEVTOOLS__: false,
     __INTLIFY_DROP_MESSAGE_COMPILER__: true,
diff --git a/packages/size-check-vue-i18n/vite.config.ts b/packages/size-check-vue-i18n/vite.config.ts
index 0e46c4164..fa38e0d60 100644
--- a/packages/size-check-vue-i18n/vite.config.ts
+++ b/packages/size-check-vue-i18n/vite.config.ts
@@ -15,7 +15,6 @@ export default defineConfig({
     __RUNTIME__: true,
     // is targeting Node (SSR)?
     __NODE_JS__: false,
-    __VUE_I18N_LEGACY_API__: false,
     __VUE_I18N_FULL_INSTALL__: false,
     __VUE_PROD_DEVTOOLS__: false,
     __INTLIFY_DROP_MESSAGE_COMPILER__: true,
diff --git a/packages/vue-i18n-core/src/warnings.ts b/packages/vue-i18n-core/src/warnings.ts
index 9bdd104a7..2caed918d 100644
--- a/packages/vue-i18n-core/src/warnings.ts
+++ b/packages/vue-i18n-core/src/warnings.ts
@@ -4,15 +4,7 @@ import { format } from '@intlify/shared'
 export const I18nWarnCodes = {
   FALLBACK_TO_ROOT: CORE_WARN_CODES_EXTEND_POINT as number, // 8
   NOT_FOUND_PARENT_SCOPE: 9,
-  IGNORE_OBJ_FLATTEN: 10,
-  /**
-   * @deprecated will be removed at vue-i18n v12
-   */
-  DEPRECATE_LEGACY_MODE: 11,
-  /**
-   * @deprecated will be removed at vue-i18n v12
-   */
-  DEPRECATE_TRANSLATE_CUSTOME_DIRECTIVE: 12
+  IGNORE_OBJ_FLATTEN: 10
 } as const
 
 type I18nWarnCodes = (typeof I18nWarnCodes)[keyof typeof I18nWarnCodes]
@@ -20,15 +12,7 @@ type I18nWarnCodes = (typeof I18nWarnCodes)[keyof typeof I18nWarnCodes]
 export const warnMessages: { [code: number]: string } = {
   [I18nWarnCodes.FALLBACK_TO_ROOT]: `Fall back to {type} '{key}' with root locale.`,
   [I18nWarnCodes.NOT_FOUND_PARENT_SCOPE]: `Not found parent scope. use the global scope.`,
-  [I18nWarnCodes.IGNORE_OBJ_FLATTEN]: `Ignore object flatten: '{key}' key has an string value`,
-  /**
-   * @deprecated will be removed at vue-i18n v12
-   */
-  [I18nWarnCodes.DEPRECATE_LEGACY_MODE]: `Legacy API mode has been deprecated in v11. Use Composition API mode instead.\nAbout how to use the Composition API mode, see https://vue-i18n.intlify.dev/guide/advanced/composition.html`,
-  /**
-   * @deprecated will be removed at vue-i18n v12
-   */
-  [I18nWarnCodes.DEPRECATE_TRANSLATE_CUSTOME_DIRECTIVE]: `'v-t' has been deprecated in v11. Use translate APIs ('t' or '$t') instead.`
+  [I18nWarnCodes.IGNORE_OBJ_FLATTEN]: `Ignore object flatten: '{key}' key has an string value`
 }
 
 export function getWarnMessage(

From 8de4d81c25d7af93c7bed1c162adb5e76f882943 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 19:33:22 +0900
Subject: [PATCH 12/18] fix others

---
 examples/lazy-loading/vite/src/i18n.ts  | 28 +++----------------------
 packages/vue-i18n-core/test/ssr.test.ts | 21 -------------------
 2 files changed, 3 insertions(+), 46 deletions(-)

diff --git a/examples/lazy-loading/vite/src/i18n.ts b/examples/lazy-loading/vite/src/i18n.ts
index 7e03d08f7..dfc2af44e 100644
--- a/examples/lazy-loading/vite/src/i18n.ts
+++ b/examples/lazy-loading/vite/src/i18n.ts
@@ -1,38 +1,16 @@
 import { nextTick, isRef } from 'vue'
 import { createI18n } from 'vue-i18n'
 
-import type {
-  I18n,
-  I18nOptions,
-  Locale,
-  VueI18n,
-  Composer,
-  I18nMode
-} from 'vue-i18n'
+import type { I18n, I18nOptions, Locale } from 'vue-i18n'
 
 export const SUPPORT_LOCALES = ['en', 'ja']
 
-function isComposer(
-  instance: VueI18n | Composer,
-  mode: I18nMode
-): instance is Composer {
-  return mode === 'composition' && isRef(instance.locale)
-}
-
 export function getLocale(i18n: I18n): string {
-  if (isComposer(i18n.global, i18n.mode)) {
-    return i18n.global.locale.value
-  } else {
-    return i18n.global.locale
-  }
+  return i18n.global.locale.value
 }
 
 export function setLocale(i18n: I18n, locale: Locale): void {
-  if (isComposer(i18n.global, i18n.mode)) {
-    i18n.global.locale.value = locale
-  } else {
-    i18n.global.locale = locale
-  }
+  i18n.global.locale.value = locale
 }
 
 export function setupI18n(options: I18nOptions = { locale: 'en' }): I18n {
diff --git a/packages/vue-i18n-core/test/ssr.test.ts b/packages/vue-i18n-core/test/ssr.test.ts
index b945796e6..78134041a 100644
--- a/packages/vue-i18n-core/test/ssr.test.ts
+++ b/packages/vue-i18n-core/test/ssr.test.ts
@@ -51,27 +51,6 @@ test('composition mode', async () => {
   expect(await renderToString(app)).toMatch(`<p>こんにちは！</p>`)
 })
 
-test('legacy mode', async () => {
-  const mockWarn = vi.spyOn(shared, 'warnOnce')
-  // eslint-disable-next-line @typescript-eslint/no-empty-function
-  mockWarn.mockImplementation(() => {})
-
-  const i18n = createI18n({
-    locale: 'ja',
-    messages: {
-      ja: { hello: 'こんにちは！' },
-      en: { hello: 'hello!' }
-    }
-  })
-
-  // NOTE: template: `<p>{{ $t('hello') }}</p>`
-  const App = () => h('p', i18n.global.t('hello'))
-  const app = createSSRApp(App)
-  app.use(i18n)
-
-  expect(await renderToString(app)).toMatch(`<p>こんにちは！</p>`)
-})
-
 test('component: i18n-t', async () => {
   const i18n = createI18n({
     locale: 'en',

From efd660dfe179888eb6093aaba657fdef69158d03 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 20:39:06 +0900
Subject: [PATCH 13/18] fix jsdoc

---
 examples/lazy-loading/vite/src/i18n.ts |  2 +-
 packages/petite-vue-i18n/src/vue.d.ts  | 21 +++++----------------
 packages/vue-i18n-core/src/i18n.ts     | 12 ++++--------
 packages/vue-i18n/src/vue.d.ts         | 23 ++---------------------
 4 files changed, 12 insertions(+), 46 deletions(-)

diff --git a/examples/lazy-loading/vite/src/i18n.ts b/examples/lazy-loading/vite/src/i18n.ts
index dfc2af44e..7bc2dc73a 100644
--- a/examples/lazy-loading/vite/src/i18n.ts
+++ b/examples/lazy-loading/vite/src/i18n.ts
@@ -1,4 +1,4 @@
-import { nextTick, isRef } from 'vue'
+import { nextTick } from 'vue'
 import { createI18n } from 'vue-i18n'
 
 import type { I18n, I18nOptions, Locale } from 'vue-i18n'
diff --git a/packages/petite-vue-i18n/src/vue.d.ts b/packages/petite-vue-i18n/src/vue.d.ts
index 296f85541..f5a6e6ead 100644
--- a/packages/petite-vue-i18n/src/vue.d.ts
+++ b/packages/petite-vue-i18n/src/vue.d.ts
@@ -9,9 +9,7 @@ import type {
   DefineLocaleMessage,
   ExportedGlobalComposer,
   RemovedIndexResources,
-  TranslateResult,
-  VueI18n,
-  VueI18nOptions
+  TranslateResult
 } from '@intlify/vue-i18n-core/petite'
 
 // --- THE CONTENT BELOW THIS LINE WILL BE APPENDED TO DTS FILE IN DIST DIRECTORY --- //
@@ -25,13 +23,6 @@ declare module 'vue' {
    * @VueI18nInjection
    */
   export interface ComponentCustomOptions {
-    /**
-     * VueI18n options
-     *
-     * @remarks
-     * See the {@link VueI18nOptions}
-     */
-    i18n?: VueI18nOptions
     /**
      * For custom blocks options
      * @internal
@@ -51,23 +42,21 @@ declare module 'vue' {
    */
   export interface ComponentCustomProperties {
     /**
-     * Exported Global Composer instance, or global VueI18n instance.
+     * Exported Global Composer instance
      *
      * @remarks
-     * You can get the {@link ExportedGlobalComposer | exported composer instance} which are exported from global {@link Composer | composer instance} created with {@link createI18n}, or global {@link VueI18n | VueI18n instance}.
-     * You can get the exported composer instance in {@link I18nMode | Composition API mode}, or the Vuei18n instance in {@link I18nMode | Legacy API mode}, which is the instance you can refer to with this property.
+     * You can get the {@link ExportedGlobalComposer | exported composer instance} which are exported from global {@link Composer | composer instance} created with {@link createI18n}
+     * You can get the exported composer instance in {@link I18nMode | Composition API mode}
      * The locales, locale messages, and other resources managed by the instance referenced by this property are valid as global scope.
      * If the `i18n` component custom option is not specified, it's the same as the VueI18n instance that can be referenced by the i18n instance {@link I18n.global | global} property.
      */
-    $i18n: VueI18n | ExportedGlobalComposer
+    $i18n: ExportedGlobalComposer
     /**
      * Locale message translation
      *
      * @remarks
      * If this is used in a reactive context, it will re-evaluate once the locale changes.
      *
-     * In {@link I18nMode | Legacy API mode}, the input / output is the same as for VueI18n instance. About that details, see {@link VueI18n#t | `VueI18n#t`}.
-     *
      * In {@link I18nMode | Composition API mode}, the `$t` is injected by `app.config.globalProperties`.
      * the input / output is the same as for Composer, and it work on **global scope**. About that details, see {@link Composer#t | `Composer#t` }.
      *
diff --git a/packages/vue-i18n-core/src/i18n.ts b/packages/vue-i18n-core/src/i18n.ts
index f73970c06..4bc2dd365 100644
--- a/packages/vue-i18n-core/src/i18n.ts
+++ b/packages/vue-i18n-core/src/i18n.ts
@@ -53,10 +53,6 @@ import type { Disposer } from './types'
 /**
  * I18n Options for `createI18n`
  *
- * @remarks
- * `I18nOptions` is inherited {@link I18nAdditionalOptions}, {@link ComposerOptions} and {@link VueI18nOptions},
- * so you can specify these options.
- *
  * @VueI18nGeneral
  */
 export type I18nOptions<
@@ -118,7 +114,7 @@ export interface I18n<
 > {
   // prettier-ignore
   /**
-   * The property accessible to the global Composer instance or VueI18n instance
+   * The property accessible to the global Composer instance
    *
    * An instance of this property is **global scope***.
    */
@@ -139,7 +135,7 @@ export interface I18n<
 export type ComposerExtender = (composer: Composer) => Disposer | undefined
 
 /**
- * The hooks that give to extend Composer (Composition API) and VueI18n instance (Options API).
+ * The hooks that give to extend Composer (Composition API)
  * This hook is mainly for vue-i18n-routing and nuxt i18n.
  *
  * @internal
@@ -393,10 +389,10 @@ export function createI18n(options: any = {}): any {
       app.__VUE_I18N_SYMBOL__ = symbol
       app.provide(app.__VUE_I18N_SYMBOL__, i18n as unknown as I18n)
 
-      // set composer & vuei18n extend hook options from plugin options
+      // set composer extend hook options from plugin options
       if (isPlainObject(options[0])) {
         const opts = options[0] as ExtendHooks
-        // Plugin options cannot be passed directly to the function that creates Composer & VueI18n,
+        // Plugin options cannot be passed directly to the function that creates Composer
         // so we keep it temporary
         ;(i18n as unknown as I18nInternal).__composerExtend =
           opts.__composerExtend
diff --git a/packages/vue-i18n/src/vue.d.ts b/packages/vue-i18n/src/vue.d.ts
index 970110936..c3a53f405 100644
--- a/packages/vue-i18n/src/vue.d.ts
+++ b/packages/vue-i18n/src/vue.d.ts
@@ -22,7 +22,6 @@ import type {
   TranslateResult,
   Translation,
   VueI18nInstance,
-  VueI18nOptions,
   VueMessageType
 } from '@intlify/vue-i18n-core'
 
@@ -37,13 +36,6 @@ declare module 'vue' {
    * @VueI18nInjection
    */
   export interface ComponentCustomOptions {
-    /**
-     * VueI18n options
-     *
-     * @remarks
-     * See the {@link VueI18nOptions}
-     */
-    i18n?: VueI18nOptions
     /**
      * For custom blocks options
      * @internal
@@ -63,11 +55,10 @@ declare module 'vue' {
    */
   export interface ComponentCustomProperties {
     /**
-     * Exported Global Composer instance, or global VueI18n instance.
+     * Exported Global Composer instance
      *
      * @remarks
-     * You can get the {@link ExportedGlobalComposer | exported composer instance} which are exported from global {@link Composer | composer instance} created with {@link createI18n}, or global {@link VueI18n | VueI18n instance}.
-     * You can get the exported composer instance in {@link I18nMode | Composition API mode}, or the Vuei18n instance in {@link I18nMode | Legacy API mode}, which is the instance you can refer to with this property.
+     * You can get the {@link ExportedGlobalComposer | exported composer instance} which are exported from global {@link Composer | composer instance} created with {@link createI18n}
      * The locales, locale messages, and other resources managed by the instance referenced by this property are valid as global scope.
      * If the `i18n` component custom option is not specified, it's the same as the VueI18n instance that can be referenced by the i18n instance {@link I18n.global | global} property.
      */
@@ -78,8 +69,6 @@ declare module 'vue' {
      * @remarks
      * If this is used in a reactive context, it will re-evaluate once the locale changes.
      *
-     * In {@link I18nMode | Legacy API mode}, the input / output is the same as for VueI18n instance. About that details, see {@link VueI18n#t | `VueI18n#t`}.
-     *
      * In {@link I18nMode | Composition API mode}, the `$t` is injected by `app.config.globalProperties`.
      * the input / output is the same as for Composer, and it work on **global scope**. About that details, see {@link Composer#t | `Composer#t` }.
      *
@@ -422,8 +411,6 @@ declare module 'vue' {
      * @remarks
      * If this is used in a reactive context, it will re-evaluate once the locale changes.
      *
-     * In {@link I18nMode | Legacy API mode}, the input / output is the same as for VueI18n instance. About that details, see {@link VueI18n#rt | `VueI18n#rt`}.
-     *
      * In {@link I18nMode | Composition API mode}, the `$rt` is injected by `app.config.globalProperties`.
      * the input / output is the same as for Composer, and it work on **global scope**. About that details, see {@link Composer#rt | `Composer#rt` }.
      *
@@ -514,8 +501,6 @@ declare module 'vue' {
      * @remarks
      * If this is used in a reactive context, it will re-evaluate once the locale changes.
      *
-     * In {@link I18nMode | Legacy API mode}, the input / output is the same as for VueI18n instance. About that details, see {@link VueI18n#d | `VueI18n#d` }.
-     *
      * In {@link I18nMode | Composition API mode}, the `$d` is injected by `app.config.globalProperties`.
      * the input / output is the same as for Composer instance, and it work on **global scope**. About that details, see {@link Composer#d | `Composer#d` }.
      *
@@ -676,8 +661,6 @@ declare module 'vue' {
      * @remarks
      * If this is used in a reactive context, it will re-evaluate once the locale changes.
      *
-     * In {@link I18nMode | Legacy API mode}, the input / output is the same as for VueI18n instance. About that details, see {@link VueI18n#n | `VueI18n.n` }.
-     *
      * In {@link I18nMode | Composition API mode}, the `$n` is injected by `app.config.globalProperties`.
      * the input / output is the same as for Composer instance,  and it work on **global scope**. About that details, see {@link Composer#n | `Composer.n` }.
      *
@@ -867,8 +850,6 @@ declare module 'vue' {
     /**
      * Locale messages getter
      *
-     * In {@link I18nMode | Legacy API mode}, the input / output is the same as for VueI18n instance. About that details, see {@link VueI18n#tm | `VueI18n#tm` }.
-     *
      * @remarks
      * In {@link I18nMode | Composition API mode}, the `$tm` is injected by `app.config.globalProperties`.
      * the input / output is the same as for Composer instance, and it work on **global scope**. About that details, see {@link Composer#tm | `Composer.tm` }.

From 6d02502aba55f487d0251c9096f1307213e0a8ff Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 20:41:21 +0900
Subject: [PATCH 14/18] fix jsdoc

---
 packages/vue-i18n-core/src/types.ts | 1 -
 1 file changed, 1 deletion(-)

diff --git a/packages/vue-i18n-core/src/types.ts b/packages/vue-i18n-core/src/types.ts
index 894b911ec..f2a01923e 100644
--- a/packages/vue-i18n-core/src/types.ts
+++ b/packages/vue-i18n-core/src/types.ts
@@ -16,7 +16,6 @@ export type Disposer = () => void
  *
  * declare module '@intlify/vue-i18n-core' {
  *   interface GeneratedTypeConfig {
- *     legacy: false
  *   }
  * }
  * ```

From 3f4fc09d8e5582d91b639fe7eb0879d76ee1cc78 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 22:20:39 +0900
Subject: [PATCH 15/18] remove legacy examples

---
 .../legacy/components/datetime-format.html    |  76 -------------
 examples/legacy/components/number-format.html |  86 ---------------
 examples/legacy/components/translation.html   |  92 ----------------
 examples/legacy/datetime.html                 |  69 ------------
 examples/legacy/fallback/basic.html           |  36 ------
 examples/legacy/fallback/component.html       |  68 ------------
 examples/legacy/fallback/format.html          |  32 ------
 examples/legacy/fallback/suppress.html        |  37 -------
 examples/legacy/formatting/linked.html        |  70 ------------
 examples/legacy/formatting/list.html          |  47 --------
 examples/legacy/formatting/literal.html       |  47 --------
 examples/legacy/formatting/named.html         |  47 --------
 examples/legacy/functions/linked.html         |  87 ---------------
 examples/legacy/functions/list.html           |  47 --------
 examples/legacy/functions/named.html          |  47 --------
 examples/legacy/functions/plural.html         |  58 ----------
 examples/legacy/missing/handler.html          |  40 -------
 examples/legacy/missing/suppress.html         |  37 -------
 examples/legacy/number.html                   |  69 ------------
 examples/legacy/plural/basic.html             |  44 --------
 examples/legacy/plural/custom.html            |  63 -----------
 examples/legacy/scope/global.html             | 104 ------------------
 examples/legacy/scope/inherit-locale.html     |  93 ----------------
 examples/legacy/scope/local.html              |  88 ---------------
 examples/legacy/started.html                  |  47 --------
 25 files changed, 1531 deletions(-)
 delete mode 100644 examples/legacy/components/datetime-format.html
 delete mode 100644 examples/legacy/components/number-format.html
 delete mode 100644 examples/legacy/components/translation.html
 delete mode 100644 examples/legacy/datetime.html
 delete mode 100644 examples/legacy/fallback/basic.html
 delete mode 100644 examples/legacy/fallback/component.html
 delete mode 100644 examples/legacy/fallback/format.html
 delete mode 100644 examples/legacy/fallback/suppress.html
 delete mode 100644 examples/legacy/formatting/linked.html
 delete mode 100644 examples/legacy/formatting/list.html
 delete mode 100644 examples/legacy/formatting/literal.html
 delete mode 100644 examples/legacy/formatting/named.html
 delete mode 100644 examples/legacy/functions/linked.html
 delete mode 100644 examples/legacy/functions/list.html
 delete mode 100644 examples/legacy/functions/named.html
 delete mode 100644 examples/legacy/functions/plural.html
 delete mode 100644 examples/legacy/missing/handler.html
 delete mode 100644 examples/legacy/missing/suppress.html
 delete mode 100644 examples/legacy/number.html
 delete mode 100644 examples/legacy/plural/basic.html
 delete mode 100644 examples/legacy/plural/custom.html
 delete mode 100644 examples/legacy/scope/global.html
 delete mode 100644 examples/legacy/scope/inherit-locale.html
 delete mode 100644 examples/legacy/scope/local.html
 delete mode 100644 examples/legacy/started.html

diff --git a/examples/legacy/components/datetime-format.html b/examples/legacy/components/datetime-format.html
deleted file mode 100644
index 47c840ba6..000000000
--- a/examples/legacy/components/datetime-format.html
+++ /dev/null
@@ -1,76 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>DatetimeFormat component examples</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <h1>DatetimeFormat component examples</h1>
-
-    <div id="app">
-      <h2>basic usages:</h2>
-      <i18n-d tag="p" class="p1" :value="new Date()"></i18n-d>
-      <i18n-d tag="p" class="p2" :value="new Date()" format="long"></i18n-d>
-      <i18n-d
-        tag="p"
-        class="p3"
-        :value="new Date()"
-        format="long"
-        locale="ja-JP-u-ca-japanese"
-      ></i18n-d>
-
-      <h2>slot usages:</h2>
-      <i18n-d
-        tag="span"
-        class="p4"
-        :value="new Date()"
-        locale="ja-JP-u-ca-japanese"
-        :format="{ key: 'long', era: 'narrow' }"
-      >
-        <template #era="props"
-          ><span style="color: green">{{ props.era }}</span></template
-        >
-      </i18n-d>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'en-US',
-        datetimeFormats: {
-          'en-US': {
-            long: {
-              year: 'numeric',
-              month: '2-digit',
-              day: '2-digit',
-              hour: '2-digit',
-              minute: '2-digit',
-              second: '2-digit'
-            }
-          },
-          'ja-JP-u-ca-japanese': {
-            long: {
-              era: 'long',
-              year: 'numeric',
-              month: 'numeric',
-              day: 'numeric',
-              hour: 'numeric',
-              minute: 'numeric',
-              second: 'numeric',
-              weekday: 'long',
-              hour12: true,
-              timeZoneName: 'long'
-            }
-          }
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/components/number-format.html b/examples/legacy/components/number-format.html
deleted file mode 100644
index cb8db41ea..000000000
--- a/examples/legacy/components/number-format.html
+++ /dev/null
@@ -1,86 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>NumberFormat component examples</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <h1>NumberFormat component examples</h1>
-
-    <div id="app">
-      <h2>basic usages:</h2>
-      <i18n-n tag="p" class="p1" :value="100"></i18n-n>
-      <i18n-n tag="p" class="p2" :value="100" format="currency"></i18n-n>
-      <i18n-n
-        tag="p"
-        class="p3"
-        :value="100"
-        format="currency"
-        locale="ja-JP"
-      ></i18n-n>
-
-      <h2>slot usages:</h2>
-      <i18n-n
-        tag="div"
-        class="slot"
-        :value="1234"
-        :format="{ key: 'currency', currency: 'EUR' }"
-      >
-        <template #currency="props"
-          ><span style="color: green">{{ props.currency }}</span></template
-        >
-        <template #integer="props"
-          ><span style="font-weight: bold">{{ props.integer }}</span></template
-        >
-        <template #group="props"
-          ><span style="font-weight: bold">{{ props.group }}</span></template
-        >
-        <template #fraction="props"
-          ><span style="font-size: small">{{ props.fraction }}</span></template
-        >
-      </i18n-n>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'en-US',
-        numberFormats: {
-          'en-US': {
-            currency: {
-              style: 'currency',
-              currency: 'USD',
-              currencyDisplay: 'symbol'
-            },
-            decimal: {
-              style: 'decimal',
-              useGrouping: false
-            }
-          },
-          'ja-JP': {
-            currency: {
-              style: 'currency',
-              currency: 'JPY',
-              currencyDisplay: 'symbol'
-            },
-            numeric: {
-              style: 'decimal',
-              useGrouping: false
-            },
-            percent: {
-              style: 'percent',
-              useGrouping: false
-            }
-          }
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/components/translation.html b/examples/legacy/components/translation.html
deleted file mode 100644
index 93fc0cc28..000000000
--- a/examples/legacy/components/translation.html
+++ /dev/null
@@ -1,92 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Translation component example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <h1>Translation component example</h1>
-
-    <div id="app">
-      <h2>localize with slot contents:</h2>
-      <i18n-t tag="p" class="name" keypath="message.named">
-        <template #name>
-          <span>kazupon</span>
-        </template>
-      </i18n-t>
-
-      <h2>localize with DOM contents:</h2>
-      <i18n-t tag="p" class="list" keypath="message.list" locale="en">
-        <span class="lang"
-          >{{ $t('message.language', [], { locale: 'en' }) }}</span
-        >
-      </i18n-t>
-
-      <h2>localize with using linked:</h2>
-      <i18n-t tag="p" class="linked" keypath="message.linked">
-        <template #name>
-          <span>かずぽん</span>
-        </template>
-      </i18n-t>
-
-      <h2>localize with using plural:</h2>
-      <form>
-        <label for="locale-select"
-          >{{ $t('message.quantity', {}, { locale: 'en' }) }}</label
-        >
-        <select id="locale-select" v-model="count">
-          <option value="0">0</option>
-          <option value="1">1</option>
-          <option value="2">2</option>
-        </select>
-      </form>
-      <i18n-t
-        tag="p"
-        class="plural"
-        keypath="message.plural"
-        locale="en"
-        :plural="count"
-      >
-        <template #n>
-          <b>{{ count }}</b>
-        </template>
-      </i18n-t>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        messages: {
-          en: {
-            message: {
-              language: 'English',
-              quantity: 'Quantity',
-              list: 'hello, {0}!',
-              named: 'hello, {name}!',
-              linked: '@:message.named How are you?',
-              plural: 'no bananas | {n} banana | {n} bananas'
-            }
-          },
-          ja: {
-            message: {
-              language: '日本語',
-              list: 'こんにちは、{0}！',
-              named: 'こんにちは、{name}！',
-              linked: '@:message.named ごきげんいかが？'
-            }
-          }
-        }
-      })
-
-      const app = createApp({
-        data: () => ({ count: 0 })
-      })
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/datetime.html b/examples/legacy/datetime.html
deleted file mode 100644
index 28a5791ab..000000000
--- a/examples/legacy/datetime.html
+++ /dev/null
@@ -1,69 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Datetime localization</title>
-    <script src="../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <h1>DateTime Localization with Legacy API</h1>
-      <form>
-        <label for="locale-select">{{ $t('language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en-US">en-US</option>
-          <option value="ja-JP">ja-JP</option>
-        </select>
-      </form>
-      <p>{{ $t('current') }}: {{ $d(now, 'long') }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja-JP',
-        messages: {
-          'en-US': {
-            language: 'Language',
-            current: 'Current Datetime'
-          },
-          'ja-JP': {
-            language: '言語',
-            current: '現在の日時'
-          }
-        },
-        datetimeFormats: {
-          'en-US': {
-            long: {
-              year: 'numeric',
-              month: '2-digit',
-              day: '2-digit',
-              hour: '2-digit',
-              minute: '2-digit',
-              second: '2-digit'
-            }
-          },
-          'ja-JP': {
-            long: {
-              year: 'numeric',
-              month: '2-digit',
-              day: '2-digit',
-              hour: '2-digit',
-              minute: '2-digit',
-              second: '2-digit',
-              hour12: true
-            }
-          }
-        }
-      })
-
-      const app = createApp({
-        data: () => ({ now: new Date() })
-      })
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/fallback/basic.html b/examples/legacy/fallback/basic.html
deleted file mode 100644
index c8369c845..000000000
--- a/examples/legacy/fallback/basic.html
+++ /dev/null
@@ -1,36 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Fallback basic example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <p>{{ $t("message.hello") }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        fallbackLocale: 'en',
-        messages: {
-          en: {
-            message: {
-              hello: 'hello world!'
-            }
-          },
-          // missing key in 'ja' locale messages ...
-          ja: {}
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/fallback/component.html b/examples/legacy/fallback/component.html
deleted file mode 100644
index e4cd564ba..000000000
--- a/examples/legacy/fallback/component.html
+++ /dev/null
@@ -1,68 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Component fallback example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-    <style>
-      #app {
-        border: red solid;
-      }
-      #component {
-        border: blue solid;
-      }
-    </style>
-  </head>
-  <body>
-    <div id="app">
-      <h1>Root</h1>
-      <p class="root">{{ $t("message.hello") }}</p>
-      <Component1 />
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        messages: {
-          en: {
-            message: {
-              hello: 'hello world',
-              greeting: 'good morning, world!'
-            }
-          },
-          ja: {
-            message: {
-              hello: 'こんにちは、世界',
-              greeting: 'おはよう、世界！'
-            }
-          }
-        }
-      })
-
-      const Component1 = {
-        template: `
-          <div id="component">
-            <h1>Component1</h1>
-            <p class="c1">Component1 locale messages: {{ $t("message.hello") }}</p>
-            <p class="c2">Fallback global locale messages: {{ $t("message.greeting") }}</p>
-          </div>
-        `,
-        i18n: {
-          messages: {
-            en: { message: { hello: 'hello component1' } },
-            ja: { message: { hello: 'こんにちは、component1' } }
-          }
-        }
-      }
-
-      const app = createApp({
-        components: { Component1 }
-      })
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/fallback/format.html b/examples/legacy/fallback/format.html
deleted file mode 100644
index f25bd7b19..000000000
--- a/examples/legacy/fallback/format.html
+++ /dev/null
@@ -1,32 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Fallback format example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <p>{{ $t("hello, {name}!", { name: 'kazupon' }) }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        formatFallbackMessages: true, // enable, fallback to locale message key
-        messages: {
-          // `hello, {name}` key is nothing in `messages` option
-          en: {},
-          ja: {}
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/fallback/suppress.html b/examples/legacy/fallback/suppress.html
deleted file mode 100644
index ddf2ff73c..000000000
--- a/examples/legacy/fallback/suppress.html
+++ /dev/null
@@ -1,37 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Fallback warning suppress example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <p>{{ $t("message.hello") }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        fallbackLocale: 'en',
-        silentFallbackWarn: true, // warning off
-        messages: {
-          en: {
-            message: {
-              hello: 'hello world!'
-            }
-          },
-          // missing key in 'ja' locale messages ...
-          ja: {}
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/formatting/linked.html b/examples/legacy/formatting/linked.html
deleted file mode 100644
index d82b605c5..000000000
--- a/examples/legacy/formatting/linked.html
+++ /dev/null
@@ -1,70 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Linked message example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <form>
-        <label for="locale-select">{{ $t('message.language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en">en</option>
-          <option value="ja">ja</option>
-        </select>
-      </form>
-      <p class="linked">{{ $t('message.linked') }}</p>
-      <label>{{ $t('message.homeAddress') }}</label>
-      <p class="error">{{ $t('message.missingHomeAddress') }}</p>
-      <p class="modifier">
-        {{ $t('message.custom_modifier', { snake: 'message.snake' }) }}
-      </p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'en',
-        messages: {
-          en: {
-            message: {
-              language: 'Language',
-              the_world: 'the world',
-              dio: 'DIO:',
-              linked: '@:message.dio @:message.the_world !!!!',
-              homeAddress: 'Home address',
-              missingHomeAddress: 'Please provide @.lower:message.homeAddress',
-              snake: 'snake case',
-              custom_modifier:
-                "custom modifiers example: @.snakeCase:{'message.snake'}"
-            }
-          },
-          ja: {
-            message: {
-              language: '言語',
-              the_world: 'ザ・ワールド',
-              dio: 'ディオ:',
-              linked: '@:message.dio @:message.the_world ！！！！',
-              homeAddress: 'ホームアドレス',
-              missingHomeAddress:
-                'どうか、@.lower:message.homeAddress を提供してください。',
-              snake: 'スネーク ケース',
-              custom_modifier:
-                "カスタム修飾子の例: @.snakeCase:{'message.snake'}"
-            }
-          }
-        },
-        modifiers: {
-          snakeCase: str => str.split(' ').join('-')
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/formatting/list.html b/examples/legacy/formatting/list.html
deleted file mode 100644
index aa65659a0..000000000
--- a/examples/legacy/formatting/list.html
+++ /dev/null
@@ -1,47 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>List interpolation example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <form>
-        <label for="locale-select">{{ $t('message.language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en">en</option>
-          <option value="ja">ja</option>
-        </select>
-      </form>
-      <p>{{ $t('message.greeting', ['kazupon']) }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        messages: {
-          en: {
-            message: {
-              language: 'Language',
-              greeting: 'Hello, {0}!'
-            }
-          },
-          ja: {
-            message: {
-              language: '言語',
-              greeting: 'こんにちは、{0}！'
-            }
-          }
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/formatting/literal.html b/examples/legacy/formatting/literal.html
deleted file mode 100644
index 5a0f53ef6..000000000
--- a/examples/legacy/formatting/literal.html
+++ /dev/null
@@ -1,47 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Literal interpolation example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <form>
-        <label for="locale-select">{{ $t('message.language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en">en</option>
-          <option value="ja">ja</option>
-        </select>
-      </form>
-      <p>{{ $t('message.greeting') }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        messages: {
-          en: {
-            message: {
-              language: 'Language',
-              greeting: "Hello, {'kazupon'}!"
-            }
-          },
-          ja: {
-            message: {
-              language: '言語',
-              greeting: "こんにちは、{'かずぽん'}！"
-            }
-          }
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/formatting/named.html b/examples/legacy/formatting/named.html
deleted file mode 100644
index 7b6928853..000000000
--- a/examples/legacy/formatting/named.html
+++ /dev/null
@@ -1,47 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Named interpolation example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <form>
-        <label for="locale-select">{{ $t('message.language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en">en</option>
-          <option value="ja">ja</option>
-        </select>
-      </form>
-      <p>{{ $t('message.greeting', { name: 'kazupon' }) }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        messages: {
-          en: {
-            message: {
-              language: 'Language',
-              greeting: 'Hello, {name}!'
-            }
-          },
-          ja: {
-            message: {
-              language: '言語',
-              greeting: 'こんにちは、{name}！'
-            }
-          }
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/functions/linked.html b/examples/legacy/functions/linked.html
deleted file mode 100644
index c83b17b67..000000000
--- a/examples/legacy/functions/linked.html
+++ /dev/null
@@ -1,87 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Example: Linked message with message function</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <form>
-        <label for="locale-select">{{ $t('message.language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en">en</option>
-          <option value="ja">ja</option>
-        </select>
-      </form>
-      <p class="linked">{{ $t('message.linked') }}</p>
-      <label>{{ $t('message.homeAddress') }}</label>
-      <p class="error">{{ $t('message.missingHomeAddress') }}</p>
-      <p class="modifier">
-        {{ $t('message.custom_modifier', { snake: 'message.snake' }) }}
-      </p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'en',
-        messages: {
-          en: {
-            message: {
-              language: 'Language',
-              the_world: 'the world',
-              dio: 'DIO:',
-              // '@:message.dio @:message.the_world !!!!'
-              linked: ({ linked }) =>
-                `${linked('message.dio')} ${linked('message.the_world')} !!!!`,
-              homeAddress: 'Home address',
-              // 'Please provide @.lower:message.homeAddress'
-              missingHomeAddress: ({ linked }) =>
-                `Please provide ${linked('message.homeAddress', 'lower')}`,
-              snake: 'snake case',
-              // "custom modifiers example: @.snakeCase:{'message.snake'}"
-              custom_modifier: ({ linked }) =>
-                `custom modifiers example: ${linked(
-                  'message.snake',
-                  'snakeCase'
-                )}`
-            }
-          },
-          ja: {
-            message: {
-              language: '言語',
-              the_world: 'ザ・ワールド',
-              dio: 'ディオ:',
-              // '@:message.dio @:message.the_world ！！！！'
-              linked: ({ linked }) =>
-                `${linked('message.dio')} ${linked(
-                  'message.the_world'
-                )} ！！！！`,
-              homeAddress: 'ホームアドレス',
-              // 'どうか、@.lower:message.homeAddress を提供してください。'
-              missingHomeAddress: ({ linked }) =>
-                `どうか、${linked(
-                  'message.homeAddress',
-                  'lower'
-                )} を提供してください。`,
-              snake: 'スネーク ケース',
-              // "カスタム修飾子の例: @.snakeCase:{'message.snake'}"
-              custom_modifier: ({ linked }) =>
-                `カスタム修飾子の例: ${linked('message.snake', 'snakeCase')}`
-            }
-          }
-        },
-        modifiers: {
-          snakeCase: str => str.split(' ').join('-')
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/functions/list.html b/examples/legacy/functions/list.html
deleted file mode 100644
index 73b7d16de..000000000
--- a/examples/legacy/functions/list.html
+++ /dev/null
@@ -1,47 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Example: List interpolation with Message Function</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <form>
-        <label for="locale-select">{{ $t('message.language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en">en</option>
-          <option value="ja">ja</option>
-        </select>
-      </form>
-      <p>{{ $t('message.greeting', ['kazupon']) }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        messages: {
-          en: {
-            message: {
-              language: 'Language',
-              greeting: ctx => `Hello, ${ctx.list(0)}!`
-            }
-          },
-          ja: {
-            message: {
-              language: '言語',
-              greeting: ctx => `こんにちは、${ctx.list(0)}！`
-            }
-          }
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/functions/named.html b/examples/legacy/functions/named.html
deleted file mode 100644
index c87481373..000000000
--- a/examples/legacy/functions/named.html
+++ /dev/null
@@ -1,47 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Example: Named interpolation with message function</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <form>
-        <label for="locale-select">{{ $t('message.language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en">en</option>
-          <option value="ja">ja</option>
-        </select>
-      </form>
-      <p>{{ $t('message.greeting', { name: 'kazupon' }) }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        messages: {
-          en: {
-            message: {
-              language: 'Language',
-              greeting: ctx => `Hello, ${ctx.named('name')}!`
-            }
-          },
-          ja: {
-            message: {
-              language: '言語',
-              greeting: ctx => `こんにちは、${ctx.named('name')}！`
-            }
-          }
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/functions/plural.html b/examples/legacy/functions/plural.html
deleted file mode 100644
index fd8bf6756..000000000
--- a/examples/legacy/functions/plural.html
+++ /dev/null
@@ -1,58 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Example: plural with message functions</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <h2>Car:</h2>
-      <p class="p1">{{ $t('car', 1) }}</p>
-      <p class="p2">{{ $t('car', 2) }}</p>
-      <h2>Apple:</h2>
-      <p class="p3">{{ $t('apple', 0) }}</p>
-      <p class="p4">{{ $t('apple', 1) }}</p>
-      <p class="p5">{{ $t('apple', { count: 10 }, 10) }}</p>
-      <p class="p6">{{ $t('apple', 10) }}</p>
-      <h2>Banana:</h2>
-      <p class="p7">{{ $t('banana', { n: 1 }, 1) }}</p>
-      <p class="p8">{{ $t('banana', 1) }}</p>
-      <p class="p9">{{ $t('banana', { n: 'too many' }, 100) }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'en',
-        messages: {
-          en: {
-            car: ({ plural }) => {
-              // 'car | cars'
-              return plural(['car', 'cars'])
-            },
-            apple: ({ plural, named }) => {
-              // 'no apples | one apple | {count} apples'
-              return plural([
-                'no apples',
-                'one apple',
-                `${named('count')} apples`
-              ])
-            },
-            banana: ({ plural, named }) => {
-              const n = named('n')
-              // 'no bananas | {n} banana | {n} bananas'
-              return plural(['no bananas', `${n} banana`, `${n} bananas`])
-            }
-          }
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/missing/handler.html b/examples/legacy/missing/handler.html
deleted file mode 100644
index dc6f29c4b..000000000
--- a/examples/legacy/missing/handler.html
+++ /dev/null
@@ -1,40 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Missing handler example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <p>{{ $t("message.hello") }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        fallbackLocale: 'en',
-        missing: (locale, key, instance) => {
-          // something to do ...
-          console.warn(`detect '${key}' key missing in '${locale}'`)
-        },
-        messages: {
-          en: {
-            message: {
-              hello: 'hello world!'
-            }
-          },
-          // missing key in 'ja' locale messages ...
-          ja: {}
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/missing/suppress.html b/examples/legacy/missing/suppress.html
deleted file mode 100644
index 9bee7fa6c..000000000
--- a/examples/legacy/missing/suppress.html
+++ /dev/null
@@ -1,37 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Missing warning suppress example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <p>{{ $t("message.hello") }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        fallbackLocale: 'en',
-        silentTranslationWarn: true, // warning off
-        messages: {
-          en: {
-            message: {
-              hello: 'hello world!'
-            }
-          },
-          // missing key in 'ja' locale messages ...
-          ja: {}
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/number.html b/examples/legacy/number.html
deleted file mode 100644
index d9a314e5b..000000000
--- a/examples/legacy/number.html
+++ /dev/null
@@ -1,69 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Number localization</title>
-    <script src="../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-    <style>
-      #app {
-        margin-left: 40px;
-      }
-      p {
-        font-weight: bold;
-      }
-    </style>
-  </head>
-  <body>
-    <div id="app">
-      <h1>Number Localization with Legacy API</h1>
-      <form>
-        <label for="locale-select">{{ $t('language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en-US">en-US</option>
-          <option value="ja-JP">ja-JP</option>
-        </select>
-      </form>
-      <p>{{ $t('money') }}: {{ $n(money, 'currency') }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja-JP',
-        messages: {
-          'en-US': {
-            language: 'Language',
-            money: 'Money'
-          },
-          'ja-JP': {
-            language: '言語',
-            money: 'お金'
-          }
-        },
-        numberFormats: {
-          'en-US': {
-            currency: {
-              style: 'currency',
-              currency: 'USD'
-            }
-          },
-          'ja-JP': {
-            currency: {
-              style: 'currency',
-              currency: 'JPY',
-              currencyDisplay: 'symbol'
-            }
-          }
-        }
-      })
-
-      const app = createApp({
-        data: () => ({ money: 1000 })
-      })
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/plural/basic.html b/examples/legacy/plural/basic.html
deleted file mode 100644
index 11a10e86b..000000000
--- a/examples/legacy/plural/basic.html
+++ /dev/null
@@ -1,44 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>plural basic usage examples</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <h2>Car:</h2>
-      <p class="p1">{{ $t('car', 1) }}</p>
-      <p class="p2">{{ $t('car', 2) }}</p>
-      <h2>Apple:</h2>
-      <p class="p3">{{ $t('apple', 0) }}</p>
-      <p class="p4">{{ $t('apple', 1) }}</p>
-      <p class="p5">{{ $t('apple', { count: 10 }, 10) }}</p>
-      <p class="p6">{{ $t('apple', 10) }}</p>
-      <h2>Banana:</h2>
-      <p class="p7">{{ $t('banana', { n: 1 }, 1) }}</p>
-      <p class="p8">{{ $t('banana', 1) }}</p>
-      <p class="p9">{{ $t('banana', { n: 'too many' }, 10) }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'en',
-        messages: {
-          en: {
-            car: 'car | cars',
-            apple: 'no apples | one apple | {count} apples',
-            banana: 'no bananas | {n} banana | {n} bananas'
-          }
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/plural/custom.html b/examples/legacy/plural/custom.html
deleted file mode 100644
index 221b0de53..000000000
--- a/examples/legacy/plural/custom.html
+++ /dev/null
@@ -1,63 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>plural custom rule usage examples</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <h2>Car:</h2>
-      <p class="p1">{{ $t('car', 1) }}</p>
-      <p class="p2">{{ $t('car', 2) }}</p>
-      <p class="p3">{{ $t('car', 4) }}</p>
-      <p class="p4">{{ $t('car', 12) }}</p>
-      <p class="p5">{{ $t('car', 21) }}</p>
-
-      <h2>Banana:</h2>
-      <p class="p6">{{ $t('banana', 0) }}</p>
-      <p class="p7">{{ $t('banana', 4) }}</p>
-      <p class="p8">{{ $t('banana', 11) }}</p>
-      <p class="p9">{{ $t('banana', 31) }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      function customRule(choice, choicesLength, orgRule) {
-        if (choice === 0) {
-          return 0
-        }
-
-        const teen = choice > 10 && choice < 20
-        const endsWithOne = choice % 10 === 1
-        if (!teen && endsWithOne) {
-          return 1
-        }
-        if (!teen && choice % 10 >= 2 && choice % 10 <= 4) {
-          return 2
-        }
-
-        return choicesLength < 4 ? 2 : 3
-      }
-
-      const i18n = createI18n({
-        locale: 'ru',
-        pluralizationRules: {
-          ru: customRule
-        },
-        messages: {
-          ru: {
-            car: '0 машин | {n} машина | {n} машины | {n} машин',
-            banana: 'нет бананов | {n} банан | {n} банана | {n} бананов'
-          }
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/scope/global.html b/examples/legacy/scope/global.html
deleted file mode 100644
index d4eaa80d9..000000000
--- a/examples/legacy/scope/global.html
+++ /dev/null
@@ -1,104 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Global scope example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <h1>Root</h1>
-      <form>
-        <label for="locale-select">{{ $t('message.language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en">en</option>
-          <option value="ja">ja</option>
-        </select>
-      </form>
-      <p class="parent">{{ $t('message.hello') }}</p>
-      <Child />
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const SlotChild = {
-        template: `
-          <p><slot/></p>
-        `
-      }
-
-      const SubChild = {
-        template: `
-          <div class="sub-child">
-            <h1>Sub Child</h1>
-            <form>
-              <label>{{ $t('message.language') }}</label>
-              <select v-model="$i18n.locale">
-                <option value="en">en</option>
-                <option value="ja">ja</option>
-              </select>
-            </form>
-            <p class="sub-child">{{ $t('message.hi') }}</p>
-          </div>
-        `
-      }
-
-      const Child = {
-        components: {
-          SubChild,
-          SlotChild
-        },
-        template: `
-          <div class="child">
-            <h1>Child</h1>
-            <form>
-              <label>{{ $t('message.language') }}</label>
-              <select v-model="$i18n.locale">
-                <option value="en">en</option>
-                <option value="ja">ja</option>
-              </select>
-            </form>
-            <p class="child">{{ $t('message.hi') }}</p>
-            <SubChild />
-            $t inside of slot
-            <SlotChild>
-              {{ $t('message.hi') }}
-            </SlotChild>
-            i18n-t inside of slot
-            <SlotChild>
-              <i18n-t keypath='message.hi'/>
-            </SlotChild>
-          </div>
-        `
-      }
-
-      const i18n = createI18n({
-        locale: 'ja',
-        messages: {
-          en: {
-            message: {
-              language: 'Language',
-              hello: 'hello world!',
-              hi: 'Hi !'
-            }
-          },
-          ja: {
-            message: {
-              language: '言語',
-              hello: 'こんにちは、世界！',
-              hi: 'こんにちは！'
-            }
-          }
-        }
-      })
-
-      const app = createApp({
-        components: { Child }
-      })
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/scope/inherit-locale.html b/examples/legacy/scope/inherit-locale.html
deleted file mode 100644
index d7246468e..000000000
--- a/examples/legacy/scope/inherit-locale.html
+++ /dev/null
@@ -1,93 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Inherit locale example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <h1>Root</h1>
-      <form>
-        <label for="locale-select">{{ $t('message.language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en">en</option>
-          <option value="ja">ja</option>
-        </select>
-      </form>
-      <p class="parent">{{ $t("message.hello") }}</p>
-      <Child />
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const Child = {
-        template: `
-          <div class="child">
-            <h1>Child</h1>
-            <form>
-              <label>{{ $t('message.language') }}</label>
-              <select v-model="$i18n.locale">
-                <option value="en">en</option>
-                <option value="ja">ja</option>
-              </select>
-              <input type="checkbox" id="checkbox" v-model="$i18n.sync">
-              <label for="checkbox">{{ $t('message.inherit') }}</label>
-            </form>
-            <p class="child">{{ $t('message.hi') }}</p>
-          </div>
-        `,
-        i18n: {
-          locale: 'en',
-          sync: true,
-          messages: {
-            en: {
-              message: {
-                language: 'Language',
-                inherit: 'Inherit locale from root',
-                hello: 'hello earth!',
-                hi: 'Hi there!'
-              }
-            },
-            ja: {
-              message: {
-                language: '言語',
-                inherit: 'root から locale を継承する',
-                hello: 'こんにちは、地球！',
-                hi: 'やあ！'
-              }
-            }
-          }
-        }
-      }
-
-      const i18n = createI18n({
-        locale: 'ja',
-        messages: {
-          en: {
-            message: {
-              language: 'Language',
-              hello: 'hello world!',
-              hi: 'Hi !'
-            }
-          },
-          ja: {
-            message: {
-              language: '言語',
-              hello: 'こんにちは、世界！',
-              hi: 'こんにちは！'
-            }
-          }
-        }
-      })
-
-      const app = createApp({
-        components: { Child }
-      })
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/scope/local.html b/examples/legacy/scope/local.html
deleted file mode 100644
index 346e10da2..000000000
--- a/examples/legacy/scope/local.html
+++ /dev/null
@@ -1,88 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Local scope example</title>
-    <script src="../../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <h1>Root</h1>
-      <form>
-        <label for="locale-select">{{ $t('message.language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en">en</option>
-          <option value="ja">ja</option>
-        </select>
-      </form>
-      <p class="parent">{{ $t("message.hello") }}</p>
-      <Child />
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const Child = {
-        template: `
-          <div class="child">
-            <h1>Child</h1>
-            <form>
-              <label>{{ $t('message.language') }}</label>
-              <select v-model="$i18n.locale">
-                <option value="en">en</option>
-                <option value="ja">ja</option>
-              </select>
-            </form>
-            <p class="child">{{ $t('message.hi') }}</p>
-          </div>
-        `,
-        i18n: {
-          locale: 'en',
-          messages: {
-            en: {
-              message: {
-                language: 'Language',
-                hello: 'hello earth!',
-                hi: 'Hi there!'
-              }
-            },
-            ja: {
-              message: {
-                language: '言語',
-                hello: 'こんにちは、地球！',
-                hi: 'やあ！'
-              }
-            }
-          }
-        }
-      }
-
-      const i18n = createI18n({
-        locale: 'ja',
-        messages: {
-          en: {
-            message: {
-              language: 'Language',
-              hello: 'hello world!',
-              hi: 'Hi !'
-            }
-          },
-          ja: {
-            message: {
-              language: '言語',
-              hello: 'こんにちは、世界！',
-              hi: 'こんにちは！'
-            }
-          }
-        }
-      })
-
-      const app = createApp({
-        components: { Child }
-      })
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>
diff --git a/examples/legacy/started.html b/examples/legacy/started.html
deleted file mode 100644
index b246e1a80..000000000
--- a/examples/legacy/started.html
+++ /dev/null
@@ -1,47 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Getting Started</title>
-    <script src="../../node_modules/vue/dist/vue.global.js"></script>
-    <script src="../../packages/vue-i18n/dist/vue-i18n.global.js"></script>
-  </head>
-  <body>
-    <div id="app">
-      <form>
-        <label for="locale-select">{{ $t('message.language') }}</label>
-        <select id="locale-select" v-model="$i18n.locale">
-          <option value="en">en</option>
-          <option value="ja">ja</option>
-        </select>
-      </form>
-      <p>{{ $t("message.hello") }}</p>
-    </div>
-    <script>
-      const { createApp } = Vue
-      const { createI18n } = VueI18n
-
-      const i18n = createI18n({
-        locale: 'ja',
-        messages: {
-          en: {
-            message: {
-              language: 'Language',
-              hello: 'hello world!'
-            }
-          },
-          ja: {
-            message: {
-              language: '言語',
-              hello: 'こんにちは、世界！'
-            }
-          }
-        }
-      })
-
-      const app = createApp({})
-      app.use(i18n)
-      app.mount('#app')
-    </script>
-  </body>
-</html>

From c7b5042e020812a984df1408e729c484c44cdcf9 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Thu, 13 Feb 2025 22:25:10 +0900
Subject: [PATCH 16/18] fix others

---
 examples/web-components/src/components/I18nHost.ce.vue | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/examples/web-components/src/components/I18nHost.ce.vue b/examples/web-components/src/components/I18nHost.ce.vue
index 69e486cc7..fe7d2c0cd 100644
--- a/examples/web-components/src/components/I18nHost.ce.vue
+++ b/examples/web-components/src/components/I18nHost.ce.vue
@@ -16,9 +16,8 @@ import { createI18n, I18nInjectionKey } from 'vue-i18n'
  *
  * NOTE:
  *  In web components only supports the composition API.
- *  It will not work in legacy API mode.
  */
-const i18n = createI18n<false>({
+const i18n = createI18n({
   locale: 'en',
   messages: {
     en: {

From 35030b9603b8c751f9757d74ca108abfb82cc953 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Fri, 14 Feb 2025 13:35:30 +0900
Subject: [PATCH 17/18] fix others

---
 examples/backend/src/main.ts                   | 2 +-
 examples/type-safe/type-annotation/src/main.ts | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/examples/backend/src/main.ts b/examples/backend/src/main.ts
index 443cacbf9..c94104227 100644
--- a/examples/backend/src/main.ts
+++ b/examples/backend/src/main.ts
@@ -11,7 +11,7 @@ import type { Locales } from './constants'
 const messages = await load<Locales>(locales)
 
 // create i18n instance
-const i18n = createI18n<[ResourceSchema], Locales, false>({
+const i18n = createI18n<[ResourceSchema], Locales>({
   locale: 'en',
   messages
 })
diff --git a/examples/type-safe/type-annotation/src/main.ts b/examples/type-safe/type-annotation/src/main.ts
index 3bc436020..aeaf4a996 100644
--- a/examples/type-safe/type-annotation/src/main.ts
+++ b/examples/type-safe/type-annotation/src/main.ts
@@ -16,8 +16,7 @@ const i18n = createI18n<
     message: MessageSchema
     number: NumberSchema
   },
-  'en-US',
-  false
+  'en-US'
 >({
   locale: 'en-US',
   messages: {

From cd0c762630b40fb5f4f7a42a9c83b2947cc58466 Mon Sep 17 00:00:00 2001
From: babu-ch <mashirohira@gmail.com>
Date: Sat, 15 Feb 2025 10:51:47 +0900
Subject: [PATCH 18/18] rollup test cases

---
 .../test/__snapshots__/i18n.test.ts.snap      |   8 +-
 packages/vue-i18n-core/test/i18n.test.ts      | 456 +++++++++---------
 packages/vue-i18n-core/test/issues.test.ts    |   4 +-
 packages/vue-i18n-core/test/ssr.test.ts       |   2 +-
 4 files changed, 227 insertions(+), 243 deletions(-)

diff --git a/packages/vue-i18n-core/test/__snapshots__/i18n.test.ts.snap b/packages/vue-i18n-core/test/__snapshots__/i18n.test.ts.snap
index d2ba3da67..eac7ea62f 100644
--- a/packages/vue-i18n-core/test/__snapshots__/i18n.test.ts.snap
+++ b/packages/vue-i18n-core/test/__snapshots__/i18n.test.ts.snap
@@ -1,9 +1,5 @@
 // Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
-exports[`slot reactivity > composable > en 1`] = `"<h1>Root</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>hello!</p><div class="child"><h1>Child</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>hello!</p><div class="sub-child"><h1>Sub Child</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>hello!</p></div> t inside of slot <p>hello!</p> i18n-t inside of slot <p>hello!</p></div>"`;
+exports[`slot reactivity > en 1`] = `"<h1>Root</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>hello!</p><div class="child"><h1>Child</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>hello!</p><div class="sub-child"><h1>Sub Child</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>hello!</p></div> t inside of slot <p>hello!</p> i18n-t inside of slot <p>hello!</p></div>"`;
 
-exports[`slot reactivity > composable > ja 1`] = `"<h1>Root</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>こんにちは！</p><div class="child"><h1>Child</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>こんにちは！</p><div class="sub-child"><h1>Sub Child</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>こんにちは！</p></div> t inside of slot <p>こんにちは！</p> i18n-t inside of slot <p>こんにちは！</p></div>"`;
-
-exports[`slot reactivity > legacy > en 1`] = `"<h1>Root</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>hello!</p><div class="child"><h1>Child</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>hello!</p><div class="sub-child"><h1>Sub Child</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>hello!</p></div> $t inside of slot <p>hello!</p> i18n-t inside of slot <p>hello!</p></div>"`;
-
-exports[`slot reactivity > legacy > ja 1`] = `"<h1>Root</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>こんにちは！</p><div class="child"><h1>Child</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>こんにちは！</p><div class="sub-child"><h1>Sub Child</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>こんにちは！</p></div> $t inside of slot <p>こんにちは！</p> i18n-t inside of slot <p>こんにちは！</p></div>"`;
+exports[`slot reactivity > ja 1`] = `"<h1>Root</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>こんにちは！</p><div class="child"><h1>Child</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>こんにちは！</p><div class="sub-child"><h1>Sub Child</h1><form><select><option value="en">en</option><option value="ja">ja</option></select></form><p>こんにちは！</p></div> t inside of slot <p>こんにちは！</p> i18n-t inside of slot <p>こんにちは！</p></div>"`;
diff --git a/packages/vue-i18n-core/test/i18n.test.ts b/packages/vue-i18n-core/test/i18n.test.ts
index cd265f895..01816a30f 100644
--- a/packages/vue-i18n-core/test/i18n.test.ts
+++ b/packages/vue-i18n-core/test/i18n.test.ts
@@ -58,18 +58,16 @@ afterEach(() => {
   setDevToolsHook(null)
 })
 
-describe('createI18n with flat json messages', () => {
-  test('composition mode', () => {
-    const i18n = createI18n({
-      flatJson: true,
-      messages: {
-        en: { 'mainMenu.buttonStart': 'Start!' }
-      }
-    })
-    const messages = i18n.global.messages.value
-    // @ts-ignore
-    expect(messages.en.mainMenu.buttonStart).toEqual('Start!')
+test('createI18n with flat json messages', () => {
+  const i18n = createI18n({
+    flatJson: true,
+    messages: {
+      en: { 'mainMenu.buttonStart': 'Start!' }
+    }
   })
+  const messages = i18n.global.messages.value
+  // @ts-ignore
+  expect(messages.en.mainMenu.buttonStart).toEqual('Start!')
 })
 
 describe('useI18n', () => {
@@ -348,7 +346,7 @@ describe('useI18n', () => {
   })
 })
 
-describe('slot reactivity', () => {
+test('slot reactivity', async () => {
   let org: any // eslint-disable-line @typescript-eslint/no-explicit-any
   let spy: any // eslint-disable-line @typescript-eslint/no-explicit-any
   beforeEach(() => {
@@ -360,98 +358,96 @@ describe('slot reactivity', () => {
     console.warn = org
   })
 
-  test('composable', async () => {
-    const i18n = createI18n({
-      locale: 'ja',
-      fallbackLocale: ['en'],
-      messages: {
-        en: {
-          hello: 'hello!'
-        },
-        ja: {
-          hello: 'こんにちは！'
-        }
+  const i18n = createI18n({
+    locale: 'ja',
+    fallbackLocale: ['en'],
+    messages: {
+      en: {
+        hello: 'hello!'
+      },
+      ja: {
+        hello: 'こんにちは！'
       }
-    })
-
-    const SlotChild = {
-      template: `<p><slot/></p>`
     }
+  })
 
-    const SubChild = {
-      template: `
-        <div class="sub-child">
-          <h1>Sub Child</h1>
-          <form>
-            <select v-model="locale">
-              <option value="en">en</option>
-              <option value="ja">ja</option>
-            </select>
-          </form>
-          <p>{{ t('hello') }}</p>
-        </div>
-      `,
-      setup() {
-        return useI18n()
-      }
+  const SlotChild = {
+    template: `<p><slot/></p>`
+  }
+
+  const SubChild = {
+    template: `
+      <div class="sub-child">
+        <h1>Sub Child</h1>
+        <form>
+          <select v-model="locale">
+            <option value="en">en</option>
+            <option value="ja">ja</option>
+          </select>
+        </form>
+        <p>{{ t('hello') }}</p>
+      </div>
+    `,
+    setup() {
+      return useI18n()
     }
+  }
 
-    const Child = {
-      components: {
-        SubChild,
-        SlotChild
-      },
-      template: `
-        <div class="child">
-          <h1>Child</h1>
-          <form>
-            <select v-model="locale">
-              <option value="en">en</option>
-              <option value="ja">ja</option>
-            </select>
-          </form>
-          <p>{{ t('hello') }}</p>
-          <SubChild />
-          t inside of slot
-          <SlotChild>
-            {{ t('hello') }}
-          </SlotChild>
-          i18n-t inside of slot
-          <SlotChild>
-            <i18n-t keypath='hello'/>
-          </SlotChild>
-        </div>
-      `,
-      setup() {
-        return useI18n()
-      }
+  const Child = {
+    components: {
+      SubChild,
+      SlotChild
+    },
+    template: `
+      <div class="child">
+        <h1>Child</h1>
+        <form>
+          <select v-model="locale">
+            <option value="en">en</option>
+            <option value="ja">ja</option>
+          </select>
+        </form>
+        <p>{{ t('hello') }}</p>
+        <SubChild />
+        t inside of slot
+        <SlotChild>
+          {{ t('hello') }}
+        </SlotChild>
+        i18n-t inside of slot
+        <SlotChild>
+          <i18n-t keypath='hello' />
+        </SlotChild>
+      </div>
+    `,
+    setup() {
+      return useI18n()
     }
+  }
 
-    const App = defineComponent({
-      components: {
-        Child
-      },
-      setup() {
-        return useI18n()
-      },
-      template: `
-        <h1>Root</h1>
-          <form>
-            <select v-model="locale">
-              <option value="en">en</option>
-              <option value="ja">ja</option>
-            </select>
-          </form>
-          <p>{{ t('hello') }}</p>
-        <Child />
-      `
-    })
-    const { html } = await mount(App, i18n as any) // eslint-disable-line @typescript-eslint/no-explicit-any
-    expect(html()).toMatchSnapshot('ja')
-    i18n.global.locale.value = 'en'
-    await nextTick()
-    expect(html()).toMatchSnapshot('en')
-  })
+  const App = defineComponent({
+    components: {
+      Child
+    },
+    setup() {
+      return useI18n()
+    },
+    template: `
+      <h1>Root</h1>
+      <form>
+        <select v-model="locale">
+          <option value="en">en</option>
+          <option value="ja">ja</option>
+        </select>
+      </form>
+      <p>{{ t('hello') }}</p>
+      <Child />
+    `
+  })
+  const { html } = await mount(App, i18n as any) // eslint-disable-line @typescript-eslint/no-explicit-any
+  expect(html()).toMatchSnapshot('ja')
+  i18n.global.locale.value = 'en'
+  await nextTick()
+  expect(html()).toMatchSnapshot('en')
 })
 
 test('multi instance', async () => {
@@ -567,62 +563,60 @@ test('merge useI18n resources to global scope', async () => {
   })
 })
 
-describe('merge i18n custom blocks to global scope', () => {
-  test('composition mode', async () => {
-    const i18n = createI18n({
-      locale: 'ja',
-      messages: {
-        en: {
-          hi: { hello: 'hello!' }
-        }
+test('merge i18n custom blocks to global scope', async () => {
+  const i18n = createI18n({
+    locale: 'ja',
+    messages: {
+      en: {
+        hi: { hello: 'hello!' }
       }
-    })
+    }
+  })
 
-    const App = defineComponent({
-      setup() {
-        const instance = getCurrentInstance()
-        if (instance == null) {
-          throw new Error()
-        }
-        const options = instance.type as ComponentOptions
-        options.__i18nGlobal = [
-          {
-            locale: 'en',
-            resource: {
-              hi: { hi: 'hi!' },
-              foo: 'foo!'
-            }
-          },
-          {
-            locale: 'ja',
-            resource: { foo: 'ふー！' }
+  const App = defineComponent({
+    setup() {
+      const instance = getCurrentInstance()
+      if (instance == null) {
+        throw new Error()
+      }
+      const options = instance.type as ComponentOptions
+      options.__i18nGlobal = [
+        {
+          locale: 'en',
+          resource: {
+            hi: { hi: 'hi!' },
+            foo: 'foo!'
           }
-        ]
-        useI18n({
-          useScope: 'global',
-          messages: {
-            ja: {
-              hello: 'こんにちは！'
-            }
+        },
+        {
+          locale: 'ja',
+          resource: { foo: 'ふー！' }
+        }
+      ]
+      useI18n({
+        useScope: 'global',
+        messages: {
+          ja: {
+            hello: 'こんにちは！'
           }
-        })
-        return {}
-      },
-      template: `<p>foo</p>`
-    })
-    await mount(App, i18n)
+        }
+      })
+      return {}
+    },
+    template: `<p>foo</p>`
+  })
+  await mount(App, i18n)
 
-    expect(i18n.global.getLocaleMessage('en')).toEqual({
-      hi: {
-        hi: 'hi!',
-        hello: 'hello!'
-      },
-      foo: 'foo!'
-    })
-    expect(i18n.global.getLocaleMessage('ja')).toEqual({
-      hello: 'こんにちは！',
-      foo: 'ふー！'
-    })
+  expect(i18n.global.getLocaleMessage('en')).toEqual({
+    hi: {
+      hi: 'hi!',
+      hello: 'hello!'
+    },
+    foo: 'foo!'
+  })
+  expect(i18n.global.getLocaleMessage('ja')).toEqual({
+    hello: 'こんにちは！',
+    foo: 'ふー！'
   })
 })
 
@@ -631,7 +625,7 @@ describe('custom pluralization', () => {
   // eslint-disable-next-line @typescript-eslint/no-empty-function
   mockWarn.mockImplementation(() => {})
 
-  test('composition', async () => {
+  test('pluralization', async () => {
     const i18n = createI18n({
       locale: 'ru',
       pluralRules: _pluralRules,
@@ -664,7 +658,7 @@ describe('custom pluralization', () => {
     expect(find('p:nth-child(5)')!.innerHTML).toEqual('21 машина')
   })
 
-  test('composition + custom block', async () => {
+  test('custom block', async () => {
     const i18n = createI18n({
       locale: 'ru'
     })
@@ -765,80 +759,76 @@ describe('release global scope', () => {
   })
 })
 
-describe('Composer & VueI18n extend hooking', () => {
-  test('composition', async () => {
-    const composerDisposeSpy = vi.fn()
-    let counter = 0
-    const composerExtendSpy = vi
-      .fn()
-      .mockImplementation((composer: Composer) => {
-        // eslint-disable-next-line @typescript-eslint/no-explicit-any
-        counter += 1
-        ;(composer as any).foo = ref(`foo${counter}`)
-        return composerDisposeSpy
-      })
-    const vueI18nExtendSpy = vi.fn()
-    const i18n = createI18n({})
+test('Composer & VueI18n extend hooking', async () => {
+  const composerDisposeSpy = vi.fn()
+  let counter = 0
+  const composerExtendSpy = vi.fn().mockImplementation((composer: Composer) => {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    counter += 1
+    ;(composer as any).foo = ref(`foo${counter}`)
+    return composerDisposeSpy
+  })
+  const vueI18nExtendSpy = vi.fn()
+  const i18n = createI18n({})
 
-    const GrandChild = defineComponent({
-      setup() {
-        // @ts-ignore
-        const { foo } = useI18n({
-          useScope: 'local'
-        })
-        return { foo }
-      },
-      template: '<p class="grand-child">{{ foo }}</p>'
-    })
+  const GrandChild = defineComponent({
+    setup() {
+      // @ts-ignore
+      const { foo } = useI18n({
+        useScope: 'local'
+      })
+      return { foo }
+    },
+    template: '<p class="grand-child">{{ foo }}</p>'
+  })
 
-    const Child = defineComponent({
-      components: {
-        GrandChild
-      },
-      setup() {
-        // @ts-ignore
-        const { foo } = useI18n({
-          useScope: 'local'
-        })
-        return { foo }
-      },
-      template: '<p class="child">{{ foo }}</p><GrandChild />'
-    })
+  const Child = defineComponent({
+    components: {
+      GrandChild
+    },
+    setup() {
+      // @ts-ignore
+      const { foo } = useI18n({
+        useScope: 'local'
+      })
+      return { foo }
+    },
+    template: '<p class="child">{{ foo }}</p><GrandChild />'
+  })
 
-    const App = defineComponent({
-      components: {
-        Child
-      },
-      setup() {
-        // @ts-ignore
-        const { foo } = useI18n() // global scope
-        return { foo }
-      },
-      template: '<p>{{ foo }}</p><Child />'
-    })
-    const { html, app } = await mount(App, i18n, {
-      pluginOptions: {
-        __composerExtend: composerExtendSpy,
-        __vueI18nExtend: vueI18nExtendSpy
-      } as any // eslint-disable-line @typescript-eslint/no-explicit-any
-    })
+  const App = defineComponent({
+    components: {
+      Child
+    },
+    setup() {
+      // @ts-ignore
+      const { foo } = useI18n() // global scope
+      return { foo }
+    },
+    template: '<p>{{ foo }}</p><Child />'
+  })
+  const { html, app } = await mount(App, i18n, {
+    pluginOptions: {
+      __composerExtend: composerExtendSpy,
+      __vueI18nExtend: vueI18nExtendSpy
+    } as any // eslint-disable-line @typescript-eslint/no-explicit-any
+  })
 
-    // Check that global is not extended
-    expect((i18n.global as any).foo).toBeUndefined() // eslint-disable-line @typescript-eslint/no-explicit-any
+  // Check that global is not extended
+  expect((i18n.global as any).foo).toBeUndefined() // eslint-disable-line @typescript-eslint/no-explicit-any
 
-    expect(html()).toBe(
-      '<p></p><p class="child">foo1</p><p class="grand-child">foo2</p>'
-    )
-    expect(composerExtendSpy).toHaveBeenCalledTimes(2)
-    expect(vueI18nExtendSpy).not.toHaveBeenCalled()
+  expect(html()).toBe(
+    '<p></p><p class="child">foo1</p><p class="grand-child">foo2</p>'
+  )
+  expect(composerExtendSpy).toHaveBeenCalledTimes(2)
+  expect(vueI18nExtendSpy).not.toHaveBeenCalled()
 
-    // dispose checking
-    app.unmount()
-    expect(composerDisposeSpy).toHaveBeenCalledTimes(2)
-  })
+  // dispose checking
+  app.unmount()
+  expect(composerDisposeSpy).toHaveBeenCalledTimes(2)
 })
 
-describe('dollar prefixed API (component injections)', () => {
+test('dollar prefixed API (component injections)', async () => {
   const mockWarn = vi.spyOn(shared, 'warn')
   // eslint-disable-next-line @typescript-eslint/no-empty-function
   mockWarn.mockImplementation(() => {})
@@ -858,17 +848,16 @@ describe('dollar prefixed API (component injections)', () => {
     }
   }
 
-  test('composition mode', async () => {
-    const i18n = createI18n({
-      locale: 'en',
-      messages
-    })
-    const App = defineComponent({
-      setup() {
-        useI18n()
-        return {}
-      },
-      template: `<div>
+  const i18n = createI18n({
+    locale: 'en',
+    messages
+  })
+  const App = defineComponent({
+    setup() {
+      useI18n()
+      return {}
+    },
+    template: `<div>
 <p>{{ $t('hello') }}</p>
 <p>{{ $t('list', ['world']) }}</p>
 <p>{{ $t('named', { name: 'world' }) }}</p>
@@ -885,16 +874,15 @@ describe('dollar prefixed API (component injections)', () => {
 <p>{{ $t('hello', {}, { locale: 'en' }) }}</p>
 <p>{{ $t('hello', [], { locale: 'ja' }) }}</p>
 </div>`
-    })
-    const wrapper = await mount(App, i18n)
-
-    expect(wrapper.html()).toEqual(
-      '<div><p>hello world!</p><p>hello, world!</p><p>hello, world!</p><p>no apples</p><p>りんご1個</p><p>default message</p><p>default msg</p><p>4 apples</p><p>default list msg</p><p>こんにちは、世界！</p><p>many apples</p><p>default named msg</p><p>こんにちは、世界！</p><p>hello world!</p><p>こんにちは、世界！</p></div>'
-    )
   })
+  const wrapper = await mount(App, i18n)
+
+  expect(wrapper.html()).toEqual(
+    '<div><p>hello world!</p><p>hello, world!</p><p>hello, world!</p><p>no apples</p><p>りんご1個</p><p>default message</p><p>default msg</p><p>4 apples</p><p>default list msg</p><p>こんにちは、世界！</p><p>many apples</p><p>default named msg</p><p>こんにちは、世界！</p><p>hello world!</p><p>こんにちは、世界！</p></div>'
+  )
 })
 
-test('`t` on Composition API mode', async () => {
+test('`t`', async () => {
   const messages = {
     en: {
       hello: 'hello world!',
diff --git a/packages/vue-i18n-core/test/issues.test.ts b/packages/vue-i18n-core/test/issues.test.ts
index b08d9349b..d39ab3707 100644
--- a/packages/vue-i18n-core/test/issues.test.ts
+++ b/packages/vue-i18n-core/test/issues.test.ts
@@ -132,7 +132,7 @@ const numberFormats: IntlNumberFormats = {
 }
 
 describe('issue #722', () => {
-  test('composition', async () => {
+  test('issue #722', async () => {
     const messages = {
       en: { language: 'English' },
       ja: { language: '日本語' }
@@ -169,7 +169,7 @@ describe('issue #722', () => {
     expect(wrapper.html()).toEqual(`<p>Hello <b>world!</b></p>`)
   })
 
-  test('v-if: composition', async () => {
+  test('v-if', async () => {
     const messages = {
       en: { language: 'English' },
       ja: { language: '日本語' }
diff --git a/packages/vue-i18n-core/test/ssr.test.ts b/packages/vue-i18n-core/test/ssr.test.ts
index 78134041a..ac8c549da 100644
--- a/packages/vue-i18n-core/test/ssr.test.ts
+++ b/packages/vue-i18n-core/test/ssr.test.ts
@@ -26,7 +26,7 @@ beforeAll(() => {
   registerLocaleFallbacker(fallbackWithLocaleChain)
 })
 
-test('composition mode', async () => {
+test('ssr', async () => {
   const i18n = createI18n({
     locale: 'en',
     messages: {}