feat: support ref in v-for, remove compat deprecation warnings

packages/runtime-core/src/compat/compatConfig.ts

@@ -46,7 +46,6 @@ export const enum DeprecationTypes {
   WATCH_ARRAY = 'WATCH_ARRAY',
   PROPS_DEFAULT_THIS = 'PROPS_DEFAULT_THIS',
 
-  V_FOR_REF = 'V_FOR_REF',
   V_ON_KEYCODE_MODIFIER = 'V_ON_KEYCODE_MODIFIER',
   CUSTOM_DIR = 'CUSTOM_DIR',
 
@@ -298,13 +297,6 @@ export const deprecationData: Record<DeprecationTypes, DeprecationData> = {
     link: `https://v3.vuejs.org/guide/migration/custom-directives.html`
   },
 
-  [DeprecationTypes.V_FOR_REF]: {
-    message:
-      `Ref usage on v-for no longer creates array ref values in Vue 3. ` +
-      `Consider using function refs or refactor to avoid ref usage altogether.`,
-    link: `https://v3.vuejs.org/guide/migration/array-refs.html`
-  },
-
   [DeprecationTypes.V_ON_KEYCODE_MODIFIER]: {
     message:
       `Using keyCode as v-on modifier is no longer supported. ` +

packages/runtime-core/src/compat/ref.ts

@@ -1,45 +0,0 @@
-import { isArray, remove } from '@vue/shared'
-import { ComponentInternalInstance, Data } from '../component'
-import { VNode } from '../vnode'
-import { DeprecationTypes, warnDeprecation } from './compatConfig'
-
-export function convertLegacyRefInFor(vnode: VNode) {
-  // refInFor
-  if (vnode.props && vnode.props.refInFor) {
-    delete vnode.props.refInFor
-    if (vnode.ref) {
-      if (isArray(vnode.ref)) {
-        vnode.ref.forEach(r => (r.f = true))
-      } else {
-        vnode.ref.f = true
-      }
-    }
-  }
-}
-
-export function registerLegacyRef(
-  refs: Data,
-  key: string,
-  value: any,
-  owner: ComponentInternalInstance,
-  isInFor: boolean | undefined,
-  isUnmount: boolean
-) {
-  const existing = refs[key]
-  if (isUnmount) {
-    if (isArray(existing)) {
-      remove(existing, value)
-    } else {
-      refs[key] = null
-    }
-  } else if (isInFor) {
-    __DEV__ && warnDeprecation(DeprecationTypes.V_FOR_REF, owner)
-    if (!isArray(existing)) {
-      refs[key] = [value]
-    } else if (!existing.includes(value)) {
-      existing.push(value)
-    }
-  } else {
-    refs[key] = value
-  }
-}