Vue · Middle · Question 56 of 75

How do you stop a watcher before the component unmounts?

const stop = watch(source, callback)
// later
stop()

✓Correct answer: Call the handle returned by watch / watchEffect
2Set the source to null
3Watchers can't be stopped manually

Explanation

Watchers created synchronously in setup stop automatically on unmount. Watchers created asynchronously must be stopped manually to avoid leaks.

Further reading

Vue: Watchers ↗

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