import { EventEmitter } from 'events';
export declare function once(emitter: EventEmitter, eventName: string): Promise<unknown>;
export declare class EventManager {
    eventEmitter: EventEmitter;
    constructor();
    emit(eventName: string, payload?: any): this;
    removeListener(eventName: any, callback: any): this;
    addEventListener(eventName: any, callback: any): this;
    on(eventName: any, callback: any): this;
    waitFor(eventName: any): Promise<unknown>;
}
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