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/** * External dependencies */ import { useRef, useEffect } from 'react'; interface Validation< T > { ( value: T, previousValue: T | undefined ): boolean; } /** * Use Previous based on https://usehooks.com/usePrevious/. * * @param {*} value * @param {Function} [validation] Function that needs to validate for the value * to be updated. */ export function usePrevious< T >( value: T, validation?: Validation< T > ): T | undefined { const ref = useRef< T >(); useEffect( () => { if ( ref.current !== value && ( ! validation || validation( value, ref.current ) ) ) { ref.current = value; } }, [ value, validation ] ); return ref.current; }
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