feat: Vue version warning in dev mode (#408)

Author: antfu

package.json

@@ -68,7 +68,7 @@
     "vue-server-renderer": "^2.6.11"
   },
   "peerDependencies": {
-    "vue": "^2.5.22"
+    "vue": ">= 2.5 < 3"
   },
   "dependencies": {
     "tslib": "^2.0.0"

src/install.ts

@@ -46,12 +46,21 @@ export function install(
     if (__DEV__) {
       assert(
         false,
-        'already installed. Vue.use(plugin) should be called only once'
+        'already installed. Vue.use(VueCompositionAPI) should be called only once.'
       )
     }
     return
   }
 
+  if (__DEV__) {
+    if (!Vue.version.startsWith('2.')) {
+      assert(
+        false,
+        `@vue/composition-api only works with Vue 2, v${Vue.version} found.`
+      )
+    }
+  }
+
   Vue.config.optionMergeStrategies.setup = function (
     parent: Function,
     child: Function

src/runtimeContext.ts

@@ -7,7 +7,10 @@ let currentVM: ComponentInstance | null = null
 
 export function getCurrentVue(): VueConstructor {
   if (__DEV__) {
-    assert(currentVue, `must call Vue.use(plugin) before using any function.`)
+    assert(
+      currentVue,
+      `must call Vue.use(VueCompositionAPI) before using any function.`
+    )
   }
 
   return currentVue!