import { Observable } from 'rxjs';
declare type O = Record<string, unknown>;
export declare type Event<P extends O = any> = {
    type: string;
    payload: P;
};
export declare type FireEvent<E extends Event = Event> = (event: E) => void;
export declare type EventBus<E extends Event = Event> = {
    readonly $: Observable<E>;
    fire: FireEvent<E>;
};
export declare type EventPump<E extends Event = Event> = {
    id: string;
    in: EventPumpIn<E>;
    out: EventPumpOut<E>;
};
export declare type EventPumpIn<E extends Event> = (fn: EventPumpInSubscriber<E>) => void;
export declare type EventPumpInSubscriber<T extends Event> = (e: T) => void;
export declare type EventPumpOut<E extends Event> = (e: E) => void;
export declare type EventPumpDirection = 'In' | 'Out';
export declare type EventPumpFilter<E extends Event = Event> = (e: EventPumpFilterArgs<E>) => boolean;
export declare type EventPumpFilterArgs<E extends Event = Event> = {
    direction: EventPumpDirection;
    event: E;
};
export {};