import { Bloc, Transition } from '../bloc';
/**
 * An interface for observing the behavior of all `Bloc` instances.
 *
 * @export
 * @class BlocObserver
 */
export declare class BlocObserver {
    /**
     * Called whenever an `event` is added to any `bloc`.
     *
     * @param {Bloc<any, any>} _bloc
     * @param {*} _event
     * @memberof BlocObserver
     */
    onEvent(_bloc: Bloc<any, any>, _event: any): void;
    /**
     * Called whenever a `transition` occurs in any `bloc`.
     *
     * @param {Bloc<any, any>} _bloc
     * @param {Transition<any, any>} _transition
     * @memberof BlocObserver
     */
    onTransition(_bloc: Bloc<any, any>, _transition: Transition<any, any>): void;
    /**
     * Called whenever an `error` occurs in any `bloc`.
     *
     * @param {Bloc<any, any>} _bloc
     * @param {*} _error
     * @memberof BlocObserver
     */
    onError(_bloc: Bloc<any, any>, _error: any): void;
}