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metamask-extension/ui/hooks/useEqualityCheck.js

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