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import * as React from 'react'; import { assignRef } from './assignRef'; import { useCallbackRef } from './useRef'; const useIsomorphicLayoutEffect = typeof window !== 'undefined' ? React.useLayoutEffect : React.useEffect; const currentValues = new WeakMap(); /** * Merges two or more refs together providing a single interface to set their value * @param {RefObject|Ref} refs * @returns {MutableRefObject} - a new ref, which translates all changes to {refs} * * @see {@link mergeRefs} a version without buit-in memoization * @see https://github.com/theKashey/use-callback-ref#usemergerefs * @example * const Component = React.forwardRef((props, ref) => { * const ownRef = useRef(); * const domRef = useMergeRefs([ref, ownRef]); // 👈 merge together * return <div ref={domRef}>...</div> * } */ export function useMergeRefs(refs, defaultValue) { const callbackRef = useCallbackRef(defaultValue || null, (newValue) => refs.forEach((ref) => assignRef(ref, newValue))); // handle refs changes - added or removed useIsomorphicLayoutEffect(() => { const oldValue = currentValues.get(callbackRef); if (oldValue) { const prevRefs = new Set(oldValue); const nextRefs = new Set(refs); const current = callbackRef.current; prevRefs.forEach((ref) => { if (!nextRefs.has(ref)) { assignRef(ref, null); } }); nextRefs.forEach((ref) => { if (!prevRefs.has(ref)) { assignRef(ref, current); } }); } currentValues.set(callbackRef, refs); }, [refs]); return callbackRef; }