81 lines
2.4 KiB
TypeScript
81 lines
2.4 KiB
TypeScript
/*
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This file is part of GNU Taler
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(C) 2021 Taler Systems S.A.
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GNU Taler is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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*
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* @author Sebastian Javier Marchano (sebasjm)
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*/
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import { StateUpdater, useState } from "preact/hooks";
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export function useLocalStorage(
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key: string,
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initialValue?: string,
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): [string | undefined, StateUpdater<string | undefined>] {
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const [storedValue, setStoredValue] = useState<string | undefined>(():
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| string
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| undefined => {
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return typeof window !== "undefined"
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? window.localStorage.getItem(key) || initialValue
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: initialValue;
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});
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const setValue = (
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value?: string | ((val?: string) => string | undefined),
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): void => {
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setStoredValue((p) => {
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const toStore = value instanceof Function ? value(p) : value;
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if (typeof window !== "undefined") {
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if (!toStore) {
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window.localStorage.removeItem(key);
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} else {
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window.localStorage.setItem(key, toStore);
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}
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}
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return toStore;
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});
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};
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return [storedValue, setValue];
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}
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//TODO: merge with the above function
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export function useNotNullLocalStorage(
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key: string,
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initialValue: string,
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): [string, StateUpdater<string>, boolean] {
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const [storedValue, setStoredValue] = useState<string>((): string => {
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return typeof window !== "undefined"
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? window.localStorage.getItem(key) || initialValue
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: initialValue;
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});
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const setValue = (value: string | ((val: string) => string)): void => {
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const valueToStore = value instanceof Function ? value(storedValue) : value;
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setStoredValue(valueToStore);
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if (typeof window !== "undefined") {
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if (!valueToStore) {
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window.localStorage.removeItem(key);
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} else {
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window.localStorage.setItem(key, valueToStore);
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}
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}
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};
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const isSaved = window.localStorage.getItem(key) !== null;
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return [storedValue, setValue, isSaved];
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}
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