97b8b8a1c4
Summary: flipper-server-companion depends on flipper-plugin. flipper-plugin includes dependencies that run only in a browser. Splitting flipper-plugin into core and browser packages helps to avoid including browser-only dependencies into flipper-server bundle. As a result, bundle size could be cut in half. Subsequently, RSS usage drops as there is twice as less code to process for V8. Note: it currently breaks external flipper-data-source package. It will be restored in subsequent diffs Reviewed By: lblasa Differential Revision: D38658285 fbshipit-source-id: 751b11fa9f3a2d938ce166687b8310ba8b059dee
39 lines
1.0 KiB
TypeScript
39 lines
1.0 KiB
TypeScript
/**
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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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* @format
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*/
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import {_AtomValue, _ReadOnlyAtom} from 'flipper-plugin-core';
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import {useState, useEffect} from 'react';
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export function useValue<T>(atom: _ReadOnlyAtom<T>): T;
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export function useValue<T>(
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atom: _ReadOnlyAtom<T> | undefined,
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defaultValue: T,
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): T;
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export function useValue<T>(
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atom: _ReadOnlyAtom<T> | undefined,
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defaultValue?: T,
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): T {
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const [localValue, setLocalValue] = useState<T>(
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atom ? atom.get() : defaultValue!,
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);
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useEffect(() => {
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if (!atom) {
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return;
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}
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// atom might have changed between mounting and effect setup
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// in that case, this will cause a re-render, otherwise not
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setLocalValue(atom.get());
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(atom as _AtomValue<T>).subscribe(setLocalValue);
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return () => {
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(atom as _AtomValue<T>).unsubscribe(setLocalValue);
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};
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}, [atom]);
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return localValue;
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}
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