Merge branch 'version-2' into vps-peerDep

Author: dummdidumm

.changeset/gentle-guests-clean.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': major
+---
+
+breaking: drop support for Svelte 3

packages/kit/package.json

@@ -41,7 +41,7 @@
 	},
 	"peerDependencies": {
 		"@sveltejs/vite-plugin-svelte": "^3.0.0",
-		"svelte": "^3.54.0 || ^4.0.0-next.0 || ^5.0.0-next.0",
+		"svelte": "^4.0.0 || ^5.0.0-next.0",
 		"vite": "^5.0.3"
 	},
 	"bin": {

packages/kit/src/core/sync/write_tsconfig.js

@@ -3,7 +3,6 @@ import path from 'node:path';
 import colors from 'kleur';
 import { posixify } from '../../utils/filesystem.js';
 import { write_if_changed } from './utils.js';
-import { ts } from './ts.js';
 
 /**
  * @param {string} cwd
@@ -129,23 +128,19 @@ export function get_tsconfig(kit, include_base_url) {
 			// essential options
 			// svelte-preprocess cannot figure out whether you have a value or a type, so tell TypeScript
 			// to enforce using \`import type\` instead of \`import\` for Types.
-			importsNotUsedAsValues: 'error',
+			// Also, TypeScript doesn't know about import usages in the template because it only sees the
+			// script of a Svelte file. Therefore preserve all value imports.
+			verbatimModuleSyntax: true,
 			// Vite compiles modules one at a time
 			isolatedModules: true,
-			// TypeScript doesn't know about import usages in the template because it only sees the
-			// script of a Svelte file. Therefore preserve all value imports. Requires TS 4.5 or higher.
-			preserveValueImports: true,
 
 			// This is required for svelte-package to work as expected
 			// Can be overwritten
 			lib: ['esnext', 'DOM', 'DOM.Iterable'],
 			moduleResolution: 'bundler',
 			module: 'esnext',
 			noEmit: true, // prevent tsconfig error "overwriting input files" - Vite handles the build and ignores this
-			target: 'esnext',
-
-			// TODO(v2): use the new flag verbatimModuleSyntax instead (requires support by Vite/Esbuild)
-			ignoreDeprecations: ts && Number(ts.version.split('.')[0]) >= 5 ? '5.0' : undefined
+			target: 'esnext'
 		},
 		include: [...include],
 		exclude