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fix(watch): for immediate watch with single source, ensure cb is called with undefined as oldValue (fix: #7074) #7075

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merged 1 commit into from
Nov 9, 2022
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fix(watch): for immediate watch with single source, ensure cb is called with undefined as oldValue (fix: #7074) #7075

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2 changes: 1 addition & 1 deletion packages/runtime-core/__tests__/apiWatch.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -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)
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9 changes: 5 additions & 4 deletions packages/runtime-core/src/apiWatch.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -333,10 +333,11 @@ 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,
oldValue === INITIAL_WATCHER_VALUE
? undefined
: (isMultiSource && oldValue[0] === INITIAL_WATCHER_VALUE)
? []
: oldValue,
onCleanup
])
oldValue = newValue
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