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import { useCallback, useState } from 'react';
/**
* Updates state, partial updates are merged into existing state values
*/
/**
* Mimics a React class component's state model, of having a single unified
* `state` object and an updater that merges updates into the existing state, as
* opposed to replacing it.
*
* ```js
* const [state, setState] = useMergeState({ name: 'Betsy', age: 24 })
*
* setState({ name: 'Johan' }) // { name: 'Johan', age: 24 }
*
* setState(state => ({ age: state.age + 10 })) // { name: 'Johan', age: 34 }
* ```
*
* @param initialState The initial state object
*/
export default function useMergeState(initialState) {
const [state, setState] = useState(initialState);
const updater = useCallback(update => {
if (update === null) return;
if (typeof update === 'function') {
setState(state => {
const nextState = update(state);
return nextState == null ? state : Object.assign({}, state, nextState);
});
} else {
setState(state => Object.assign({}, state, update));
}
}, [setState]);
return [state, updater];
}