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28 lines
957 B
TypeScript
28 lines
957 B
TypeScript
/*
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Copyright 2020 The Matrix.org Foundation C.I.C.
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Licensed 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.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import {useState, useEffect, DependencyList} from 'react';
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type Fn<T> = () => Promise<T>;
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export const useAsyncMemo = <T>(fn: Fn<T>, deps: DependencyList, initialValue?: T): T => {
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const [value, setValue] = useState<T>(initialValue);
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useEffect(() => {
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fn().then(setValue);
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}, deps); // eslint-disable-line react-hooks/exhaustive-deps
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return value;
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};
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