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useDebouncedCallback doesn't consider its dependencies #420

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fabn opened this issue Nov 29, 2023 · 2 comments
Open

useDebouncedCallback doesn't consider its dependencies #420

fabn opened this issue Nov 29, 2023 · 2 comments
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bug Something isn't working good first issue Good for newcomers help wanted Extra attention is needed

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@fabn
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fabn commented Nov 29, 2023

Describe the bug

This is the same issue reported in #386 for useDebouncedCallback, I don't know why that issue has been closed. I'd expect that any dependency given as args will invalidate the callback but that's not the case because deps are not given to the useEffect call here. As result the callback sees the values as one step behind.

To Reproduce

Here's a codesandbox to reproduce the issue https://codesandbox.io/p/sandbox/pedantic-grass-f9f6qw

Expected behavior

When I click on useDebouncedCallback button I should see same values as other buttons in console, but I see the old counter value.

Screenshots

image

@antonioru
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Hey @fabn thanks for opening this issue, I really appreciate it
Yeah this is definitely a bug and should be a one-liner, please feel free to open a PR yourself if you feel like it

@antonioru antonioru added bug Something isn't working help wanted Extra attention is needed good first issue Good for newcomers labels Nov 30, 2023
@fabn
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fabn commented Dec 3, 2023

I tried various changes including this one but it seems to not fix the problem.

const useDebouncedCallback = <TCallback extends GenericFunction>
  (fn: TCallback, dependencies?: DependencyList, wait: number = 600, options: DebounceOptions = defaultOptions) => {
  const debounced = useRef(debounce<TCallback>(fn, wait, options))
  const actualDependencies = dependencies ?? []

  useEffect(() => {
    debounced.current = debounce(fn, wait, options)
  }, [fn, wait, options, ...actualDependencies])

  useWillUnmount(() => {
    debounced.current?.cancel()
  })

  return useCallback(debounced.current, actualDependencies)
}

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Labels
bug Something isn't working good first issue Good for newcomers help wanted Extra attention is needed
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