import { Emitter } from './emitter';
export interface AsyncEventCancellationToken {
    isCancellationRequested: boolean;
}
export interface IWaitUntil {
    token: AsyncEventCancellationToken;
    waitUntil(thenable: Promise<unknown>): void;
}
export type IWaitUntilData<T> = Omit<Omit<T, 'waitUntil'>, 'token'>;
export declare class AsyncEmitter<T extends IWaitUntil> extends Emitter<T> {
    private _asyncDeliveryQueue?;
    emitAsync(data: IWaitUntilData<T>, token: AsyncEventCancellationToken, promiseJoin?: (p: Promise<unknown>, listener: Function) => Promise<unknown>): Promise<void>;
}