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[Vue warn]: Property undefined was accessed during render but is not defined on instance. #2910

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[Vue warn]: Property undefined was accessed during render but is not defined on instance. #2910

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2 changes: 1 addition & 1 deletion packages/runtime-core/__tests__/componentProxy.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -240,6 +240,6 @@ describe('component: proxy', () => {
`Property ${JSON.stringify(
Symbol.unscopables
)} was accessed during render ` + `but is not defined on instance.`
).toHaveBeenWarned()
).not.toHaveBeenWarned()
})
})
8 changes: 7 additions & 1 deletion packages/runtime-core/src/componentPublicInstance.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -241,7 +241,7 @@ export interface ComponentRenderContext {
}

export const PublicInstanceProxyHandlers: ProxyHandler<any> = {
get({ _: instance }: ComponentRenderContext, key: string) {
get({ _: instance }: ComponentRenderContext, keyOrSymbol: string | symbol) {
const {
ctx,
setupState,
Expand All @@ -251,12 +251,18 @@ export const PublicInstanceProxyHandlers: ProxyHandler<any> = {
type,
appContext
} = instance
const key = keyOrSymbol as string

// let @vue/reactivity know it should never observe Vue public instances.
if (key === ReactiveFlags.SKIP) {
return true
}

// this seems to come from the `with(_ctx) {}` used in render functions
if (keyOrSymbol === Symbol.unscopables) {
return undefined
}

// for internal formatters to know that this is a Vue instance
if (__DEV__ && key === '__isVue') {
return true
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