491f0cd08a
* Copyright headers 1 * Licence headers 2 * Copyright Headers 3 * Copyright Headers 4 * Copyright Headers 5 * Copyright Headers 6 * Copyright headers 7 * Add copyright headers for html and config file * Replace license files and update package.json * Update with CLA * lint
29 lines
964 B
TypeScript
29 lines
964 B
TypeScript
/*
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Copyright 2024 New Vector Ltd.
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Copyright 2020 The Matrix.org Foundation C.I.C.
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SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
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Please see LICENSE files in the repository root for full details.
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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 function useAsyncMemo<T>(fn: Fn<T>, deps: DependencyList, initialValue: T): T;
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export function useAsyncMemo<T>(fn: Fn<T>, deps: DependencyList, initialValue?: T): T | undefined;
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export function useAsyncMemo<T>(fn: Fn<T>, deps: DependencyList, initialValue?: T): T | undefined {
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const [value, setValue] = useState<T | undefined>(initialValue);
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useEffect(() => {
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let discard = false;
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fn().then((v) => {
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if (!discard) {
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setValue(v);
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}
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});
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return () => {
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discard = true;
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};
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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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