interface UseMergeValueOptions<T> {
    value?: T;
    onChange?: (value: T) => void;
}
/**
 * A custom hook that manages a component's internal state while allowing
 * the use of an externally controlled value (`value` and `onChange`) if provided.
 *
 * @template T The type of the state.
 * @param defaultValue The initial default value if a controlled `value` is not provided.
 * @param options Options for providing a controlled `value` and an `onChange` handler.
 * @returns A tuple with the current state and the function to update it.
 */
export declare function useMergeValue<T>(defaultValue: T, options?: UseMergeValueOptions<T>): [T, (newValue: T) => void];
export {};
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