export interface IEventData<T = any> {
    name: string;
    data: T;
}
export type IEventFilter = (event: IEventData) => boolean;
export type IEventHandler<T = any> = (eventData: IEventData<T>) => boolean | void | Promise<boolean> | Promise<void>;
export interface ISubscription {
    filter: IEventFilter;
    handler: IEventHandler;
}
export interface ISubscriptionResult {
    unsubscribe: () => boolean;
}
export declare function subscribe<T = any>(nameOrFilter: string | IEventFilter, handler: IEventHandler<T>): ISubscriptionResult;
export declare function subscribeDebounce<T = any>(nameOrFilter: string | IEventFilter, handler: IEventHandler<T>, debounceMs: number): ISubscriptionResult;
export declare function emit(event: IEventData): Promise<boolean>;
export type IHandler<T> = (data: T) => boolean | void | Promise<boolean> | Promise<void>;
export interface IEvent<T> {
    eventName: () => string;
    subscribe: (handler: IHandler<T>) => ISubscriptionResult;
    next: () => Promise<T>;
    union: <U>(event: IEvent<U>) => IEvent<T | U>;
}
export declare class Event<T> implements IEvent<T> {
    readonly _eventName: string;
    constructor(_eventName: string);
    eventName: () => string;
    emit(data: T): Promise<boolean>;
    subscribe: (handler: IHandler<T>, debounceMs?: number) => ISubscriptionResult;
    next: () => Promise<T>;
    union: <U>(event: IEvent<U>) => IEvent<T | U>;
}
export declare function unionEvents(...events: IEvent<any>[]): IEvent<any>;