37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
Plaintext
/*
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* Copyright 2020 Adobe. All rights reserved.
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* This file is licensed to you under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under
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* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
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* OF ANY KIND, either express or implied. See the License for the specific language
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* governing permissions and limitations under the License.
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*/
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import {EffectCallback, useEffect, useRef} from 'react';
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// Like useEffect, but only called for updates after the initial render.
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export function useUpdateEffect(effect: EffectCallback, dependencies: any[]) {
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const isInitialMount = useRef(true);
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const lastDeps = useRef<any[] | null>(null);
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useEffect(() => {
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isInitialMount.current = true;
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return () => {
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isInitialMount.current = false;
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};
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}, []);
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useEffect(() => {
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if (isInitialMount.current) {
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isInitialMount.current = false;
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} else if (!lastDeps.current || dependencies.some((dep, i) => !Object.is(dep, lastDeps[i]))) {
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effect();
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}
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lastDeps.current = dependencies;
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// eslint-disable-next-line react-hooks/exhaustive-deps
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}, dependencies);
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}
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