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index.js
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index.js
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import { useState, useEffect, useDebugValue } from 'react';
// TODO: use deepEqual for objects
// this check is currently only really useful for boolean, number, and string
const equal = (a, b) => a === b;
const defaultOptions = {
clearIfDefault: true,
};
const tryRetrieve = (key, fallback) => {
try {
const value = window.localStorage.getItem(key);
return value ? JSON.parse(value) : fallback;
} catch (e) {
console.warn(`react hook useLocalStorage: reading ${key} from localStorage failed: ${e}`);
return fallback;
}
};
export const useLocalStorage = (key, defaultValue, options) => {
const effectiveOptions = {...defaultOptions, ...options};
const [value, setState] = useState(() => tryRetrieve(key, defaultValue));
useEffect(
() => {
try {
if (effectiveOptions.clearIfDefault && equal(value, defaultValue))
window.localStorage.removeItem(key);
else
window.localStorage.setItem(key, JSON.stringify(value));
} catch (e) {
console.warn(`react hook useLocalStorage: writing ${key} to localStorage failed: ${e}`);
}
},
[key, value, effectiveOptions.clearIfDefault, defaultValue],
);
useDebugValue(value);
return [value, setState];
};