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28 lines
943 B
JavaScript
28 lines
943 B
JavaScript
import { useState, useLayoutEffect } from 'react';
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import { isEqual } from 'lodash';
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/**
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* Given a value and a function to determine equality, return a
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* referentially equal value if the equality function returns true.
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* This hook is helpful in avoiding re-renders and effects running
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* based on an object or value that always changes references but
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* infrequently changes it's value. By default, uses isEqual from
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* lodash. This is typically only useful with objects and arrays.
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*
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* @param {T} value - any value to check equality of
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* @param {(T, T) => boolean} equalityFn - A function to determine equality
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* @returns {T}
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*/
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export function useEqualityCheck(value, equalityFn = isEqual) {
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const [computedValue, setComputedValue] = useState(value);
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useLayoutEffect(() => {
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if (!equalityFn(value, computedValue)) {
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setComputedValue(value);
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}
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}, [value, equalityFn, computedValue]);
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return computedValue;
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}
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