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fix(watch): for immediate watch with single source, ensure cb is called with undefined as oldValue (#7075) 

fix: #7074
This commit is contained in:
Thorsten Lünborg 2022-11-10 00:19:35 +01:00 committed by GitHub
parent 9a816dcec0
commit 5dc593ba28
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 6 additions and 5 deletions
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2
packages/runtime-core/__tests__/apiWatch.spec.ts
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@ -745,7 +745,7 @@ describe('api: watch', () => {
const state = ref()
const spy = jest.fn()
watch(() => state.value, spy, { immediate: true })
expect(spy).toHaveBeenCalled()
expect(spy).toHaveBeenCalledWith(undefined, undefined, expect.any(Function))
state.value = 3
await nextTick()
expect(spy).toHaveBeenCalledTimes(2)

5
packages/runtime-core/src/apiWatch.ts
View File

@ -333,8 +333,9 @@ function doWatch(
callWithAsyncErrorHandling(cb, instance, ErrorCodes.WATCH_CALLBACK, [
newValue,
// pass undefined as the old value when it's changed for the first time
oldValue === INITIAL_WATCHER_VALUE ||
(isMultiSource && oldValue[0] === INITIAL_WATCHER_VALUE)
oldValue === INITIAL_WATCHER_VALUE
? undefined
: (isMultiSource && oldValue[0] === INITIAL_WATCHER_VALUE)
? []
: oldValue,
onCleanup