/// <reference types="node" />
export declare function callback_opts(f: Function): (opts?: any) => Promise<any>;
interface RetryUntilSuccess<T> {
    f: () => Promise<T>;
    start_delay?: number;
    max_delay?: number;
    max_tries?: number;
    max_time?: number;
    factor?: number;
    log?: Function;
    desc?: string;
}
export declare function retry_until_success<T>(opts: RetryUntilSuccess<T>): Promise<T>;
import { EventEmitter } from "events";
export declare function once(obj: EventEmitter, event: string, timeout_ms?: number): Promise<any>;
export declare function callback2(f: Function, opts?: any): Promise<any>;
export declare function reuse_in_flight_methods(obj: any, method_names: string[]): void;
export declare function cancel_scheduled(f: any): void;
export declare function async_as_callback(f: Function, cb: Function, ...args: any[]): Promise<void>;
export {};