CODE EXAMPLE FOR TYPESCRIPT

Update an object as state with React hooks

const [state, setState] = useState({ fName: "", lName: "" });
const handleChange = e => {
    const { name, value } = e.target;
    setState(prevState => ({
        ...prevState,
        [name]: value
    }));
};

<input
    value={state.fName}
    type="text"
    onChange={handleChange}
    name="fName"
/>
<input
    value={state.lName}
    type="text"
    onChange={handleChange}
    name="lName"
/>