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packages/use-subscription/src/useSubscription.js
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Andrew Clark
[Codemod] Update copyright header to Meta (#25315)
18 окт 2022, 18:19
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18 окт 2022, 18:19
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/** * Copyright (c) Meta Platforms, Inc. and affiliates. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. * * @flow */ import {useSyncExternalStore} from 'use-sync-external-store/shim'; // Hook used for safely managing subscriptions in concurrent mode. // // In order to avoid removing and re-adding subscriptions each time this hook is called, // the parameters passed to this hook should be memoized in some way– // either by wrapping the entire params object with useMemo() // or by wrapping the individual callbacks with useCallback(). export function useSubscription<Value>({ // (Synchronously) returns the current value of our subscription. getCurrentValue, // This function is passed an event handler to attach to the subscription. // It should return an unsubscribe function that removes the handler. subscribe, }: { getCurrentValue: () => Value, subscribe: (callback: Function) => () => void, }): Value { return useSyncExternalStore(subscribe, getCurrentValue); }