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type Updater<TState> = (state: TState) => Partial<TState> | null;
/**
* Updates state, partial updates are merged into existing state values
*/
export type MergeStateSetter<TState> = (update: Updater<TState> | Partial<TState> | null) => void;
/**
* 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<TState extends {}>(initialState: TState | (() => TState)): [TState, MergeStateSetter<TState>];
export {};