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