40 lines
1.2 KiB
Plaintext
40 lines
1.2 KiB
Plaintext
import { useState } from 'react';
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/**
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* creates a MutableRef with ref change callback
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* @param initialValue - initial ref value
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* @param {Function} callback - a callback to run when value changes
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*
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* @example
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* const ref = useCallbackRef(0, (newValue, oldValue) => console.log(oldValue, '->', newValue);
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* ref.current = 1;
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* // prints 0 -> 1
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*
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* @see https://reactjs.org/docs/hooks-reference.html#useref
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* @see https://github.com/theKashey/use-callback-ref#usecallbackref---to-replace-reactuseref
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* @returns {MutableRefObject}
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*/
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export function useCallbackRef(initialValue, callback) {
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var ref = useState(function () { return ({
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// value
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value: initialValue,
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// last callback
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callback: callback,
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// "memoized" public interface
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facade: {
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get current() {
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return ref.value;
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},
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set current(value) {
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var last = ref.value;
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if (last !== value) {
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ref.value = value;
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ref.callback(value, last);
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}
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},
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},
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}); })[0];
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// update callback
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ref.callback = callback;
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return ref.facade;
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}
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