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import { useState, useCallback } from 'react';
type Value = string | null;
type Setter = (value: Value) => void;
export default (key: string): [Value, Setter] => {
const [state, setState] = useState<Value>(() => localStorage.getItem(key) || null);
const update: Setter = useCallback(value => {
if (value) localStorage.setItem(key, value);
else localStorage.removeItem(key);
setState(value);
}, [key]);
return [state, update];
};
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