dx(compiler-sfc): warn when disabled defineModel

Author: sxzz

packages/compiler-sfc/__tests__/compileScript/defineModel.spec.ts

@@ -176,4 +176,18 @@ describe('defineModel()', () => {
       optional: BindingTypes.SETUP_REF
     })
   })
+
+  test('should warn when disabled', () => {
+    compile(
+      `
+      <script setup lang="ts">
+      const modelValue = defineModel<boolean>()
+      </script>
+      `,
+      { defineModel: false }
+    )
+    expect(
+      'defineModel() is an experimental feature and disabled by default.'
+    ).toHaveBeenWarned()
+  })
 })

packages/compiler-sfc/src/script/defineModel.ts

@@ -9,7 +9,7 @@ import {
   unwrapTSNode
 } from './utils'
 import { BindingTypes } from '@vue/compiler-dom'
-import { warnOnce } from '../warn'
+import { warn, warnOnce } from '../warn'
 
 export const DEFINE_MODEL = 'defineModel'
 
@@ -24,7 +24,15 @@ export function processDefineModel(
   node: Node,
   declId?: LVal
 ): boolean {
-  if (!ctx.options.defineModel || !isCallOf(node, DEFINE_MODEL)) {
+  if (!isCallOf(node, DEFINE_MODEL)) {
+    return false
+  }
+
+  if (!ctx.options.defineModel) {
+    warn(
+      `defineModel() is an experimental feature and disabled by default.\n` +
+        `To enable it, follow the RFC at https://github.com/vuejs/rfcs/discussions/503.`
+    )
     return false
   }