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useStateCallback typescript generic

Outrageous Octopus answered on June 21, 2022 Popularity 1/10 Helpfulness 1/10

answer useStateCallback typescript generic

useStateCallback typescript generic

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import { useCallback, useEffect, useRef, useState } from 'react';

export type Maybe<V> = V | null;

export type UseStateCallbackResult<V> = [V, (newState: V, cb: (value: V) => void) => void];

export function useStateCallback<V>(initialState: V): UseStateCallbackResult<V> {
  const [state, setState] = useState<V>(initialState);
  const cbRef = useRef<Maybe<(value: V) => void>>(null);

  const setStateCallback = useCallback((newState, cb: (value: V) => void) => {
    cbRef.current = cb;
    setState(newState);
  }, []);

  useEffect(() => {
    if (cbRef.current) {
      cbRef.current?.(state);
      cbRef.current = null;
    }
  }, [state]);

  return [state, setStateCallback];
}

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Contributed on Jun 21 2022

Outrageous Octopus

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useStateCallback typescript generic

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