const [savedHistory, setSavedHistory] = useState(localStorage.getItem('history') || {});I'm facing an issue in TypeScript where it doesn't recognize the type of 'history' once I fetch it from localStorage. How can I reassign the type so that I can use it like:
JSON.parse(savedHistory).id
It's unfortunate that localStorage.getItem only returns a string or null, making it challenging to inject the correct type after JSON parsing without a type cast/assertion.
To address this limitation, I suggest creating a wrapper function for localStorage.getItem that handles the parsing and type conversion:
const getHistory = () => {
const json = localStorage.getItem('x') ?? '{}';
return JSON.parse(json) as { id?: number };
// Modify the number type as needed
};
// ...
// Fetch initial history once instead of on every render:
const initialHistory = getHistory();
const App = () => {
const [history, setHistory] = useState(initialHistory);
By using this method, the history variable will hold a typed object rather than a string, which is more convenient for manipulation.
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