/**
 * Function that reduces previous and next state to single value.
 */
export declare type Detector<TState = any, TResult = any> = (prevState: TState | undefined, nextState: TState | undefined) => TResult;
/**
 * Function that compares previous and next state and can return action, array of actions or nothing.
 */
export declare type ActionsDetector<TState = any, TAction = any> = Detector<TState, TAction | TAction[] | void>;
/**
 * Function that compares previous and next state and returns boolean value
 */
export declare type ConditionDetector<TState = any> = Detector<TState, boolean>;