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45 lines
1.3 KiB
45 lines
1.3 KiB
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict
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* @format
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*/
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import {useCallback} from 'react';
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type CallbackRef<T> = T => mixed;
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type ObjectRef<T> = {current: T, ...};
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type Ref<T> = CallbackRef<T> | ObjectRef<T>;
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/**
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* Constructs a new ref that forwards new values to each of the given refs. The
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* given refs will always be invoked in the order that they are supplied.
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*
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* WARNING: A known problem of merging refs using this approach is that if any
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* of the given refs change, the returned callback ref will also be changed. If
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* the returned callback ref is supplied as a `ref` to a React element, this may
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* lead to problems with the given refs being invoked more times than desired.
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*/
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export default function useMergeRefs<T>(
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...refs: $ReadOnlyArray<?Ref<T>>
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): CallbackRef<T> {
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return useCallback(
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(current: T) => {
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for (const ref of refs) {
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if (ref != null) {
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if (typeof ref === 'function') {
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ref(current);
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} else {
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ref.current = current;
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}
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}
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}
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},
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[...refs], // eslint-disable-line react-hooks/exhaustive-deps
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);
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}
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