39 lines
1.1 KiB
TypeScript
39 lines
1.1 KiB
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 { Dispatch, useCallback, useEffect, useState } from "react";
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const getValue = <T>(key: string, initialValue: T): T => {
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try {
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const item = window.localStorage.getItem(key);
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return item ? JSON.parse(item) : initialValue;
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} catch {
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return initialValue;
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}
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};
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// Hook behaving like useState but persisting the value to localStorage. Returns same as useState
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export const useLocalStorageState = <T>(key: string, initialValue: T): [T, Dispatch<T>] => {
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const lsKey = "mx_" + key;
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const [value, setValue] = useState<T>(getValue(lsKey, initialValue));
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useEffect(() => {
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setValue(getValue(lsKey, initialValue));
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}, [lsKey, initialValue]);
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const _setValue: Dispatch<T> = useCallback(
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(v: T) => {
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window.localStorage.setItem(lsKey, JSON.stringify(v));
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setValue(v);
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},
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[lsKey],
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);
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return [value, _setValue];
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};
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