/**
 * @file Utilities for resuming and throttling promises
 */
import { AuthenticationParameters } from './api_interfaces';
/**
 * interface def
 */
export interface Backoff<T, U> {
    promise_args: T;
    retry_timeout_ms: number;
    retry_delay_ms: number;
    permanent_error_message: string;
    promise(args: T): Promise<U>;
}
/**
 * interface def
 */
export interface RetryPromise<T, U> {
    promise_args: T;
    retry_delay_ms: number;
    permanent_error_message: string;
    promise(args: T): Promise<U>;
}
/**
 * backoff
 */
export declare function backoff<T, U>(args: Backoff<T, U>): Promise<U>;
/**
 * retryPromise
 */
export declare function retryPromise<T, U>(args: RetryPromise<T, U>): Promise<U>;
/**
 * sleep
 */
export declare function sleep(milliseconds: number): Promise<void>;
/**
 * getUTCNowDateString
 */
export declare function getUTCNowDateString(): string;
/**
 * Custom serializer for axios query parameters
 */
export declare function authenticationRequestSerializer(params: AuthenticationParameters): string;
/**
 * Replace a parameter placeholder in an url with a value
 */
export declare function insertPathParameter(path: string, key: string, value: string): string;
/**
 * Get a single url parameter value from an url
 */
export declare function getUrlParameterValue(url: string, key: string): string | undefined;