mirror of
https://github.com/gravitational/teleport.git
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61 lines
1.6 KiB
TypeScript
61 lines
1.6 KiB
TypeScript
/**
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* Teleport
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* Copyright (C) 2023 Gravitational, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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import {
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Dispatch,
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SetStateAction,
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useCallback,
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useEffect,
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useState,
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} from 'react';
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export function useLocalStorage<T>(
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key: string,
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initialValue: T
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): [T, Dispatch<SetStateAction<T>>] {
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const read = useCallback(() => {
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const value = window.localStorage.getItem(key);
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if (!value) {
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return initialValue;
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}
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try {
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return JSON.parse(value) as T;
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} catch (err) {
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return initialValue;
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}
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}, [initialValue, key]);
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const [storedValue, setStoredValue] = useState<T>(read());
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const write = useCallback((value: SetStateAction<T>) => {
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const newValue = value instanceof Function ? value(storedValue) : value;
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window.localStorage.setItem(key, JSON.stringify(newValue));
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setStoredValue(newValue);
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}, []);
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useEffect(() => {
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setStoredValue(read());
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}, []);
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return [storedValue, write];
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}
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