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useLocalStorage.ts
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43 lines (38 loc) · 1.34 KB
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import { useState } from "react";
import { version } from "../package.json";
const prefix = `transform:${version}:`;
export function useLocalStorage(key, initialValue) {
// State to store our value
// Pass initial state function to useState so logic is only executed once
const [storedValue, setStoredValue] = useState(() => {
try {
// Get from local storage by key
const item = IN_BROWSER
? window.localStorage.getItem(prefix + key) || initialValue
: initialValue;
// Parse stored json or if none return initialValue
return JSON.parse(item);
} catch (error) {
// If error also return initialValue
return initialValue;
}
});
// Return a wrapped version of useState's setter function that ...
// ... persists the new value to sessionStorage.
const setValue = value => {
try {
// Allow value to be a function so we have same API as useState
const valueToStore =
value instanceof Function ? value(storedValue) : value;
// Save state
setStoredValue(valueToStore);
// Save to local storage
if (IN_BROWSER)
window.localStorage.setItem(prefix + key, JSON.stringify(valueToStore));
} catch (error) {
// A more advanced implementation would handle the error case
console.log(error);
}
};
return [storedValue, setValue];
}