import type { Predicate } from '../types/index.js';
import { Loggable } from '../logger/loggable.js';
export type EventHandler<T = any> = (data?: T) => void | Promise<void>;
type Unsubscribe = () => void;
export interface IEvent<T = any> {
    on(handler: EventHandler<T>): () => void;
    off(handler: EventHandler<T>): void;
}
export declare class Event<T = any> extends Loggable implements IEvent<T> {
    private _handlers;
    get isEmpty(): boolean;
    protected getLoggerName(name: string | undefined): string;
    /** Clears handlers list */
    resetHandlers: () => void;
    on(handler: EventHandler<T>): Unsubscribe;
    off(handler: EventHandler<T>): void;
    trigger(data?: T): void;
    triggerAsync(data?: T): Promise<Error[]>;
    expose(): IEvent<T>;
    private logError;
}
export declare function oneTimeSubscription<T>(e: IEvent<T>, filter?: Predicate<T | undefined>): Promise<T | undefined>;
export {};