import { StateDispatch } from '../types';
type UseValidatedStateReturn<T, E> = [state: T, error: E | null, setState: StateDispatch<T>];
/** A `setState` wrapper that performs some validation on any new state values
 * @param intialState - The initial state value to store
 * @param validator - a validator function to check any new state values against before updating.
 * The validator is expected to return either nothing, or a value of type `E`. If nothing is returned
 * the value is assumed to valid and will be updated. If a value is returned, it will be set as the error value
 * @returns an array of:
 *  - The state value
 *  - The current error value (defaults to null)
 *  - state setter function
 */
export declare function useValidatedState<T, E = string>(intialState: T, validator: (newState: T) => void | E): UseValidatedStateReturn<T, E>;
export {};