import { IBackoffStrategy } from "./BackoffStrategy";
/**
 * Exponential backoff strategy that when supplied with a startMs value will
 * increment the timeout based on powers of the base. It uses the general
 * exponential function equation:
 *
 * ```
 * timeout = ab^x
 * ```
 */
export declare class ExponentialBackoff implements IBackoffStrategy {
    readonly startMs: number;
    readonly base: number;
    readonly waitFn: (timeoutMs: number) => Promise<void>;
    timeout: number;
    exp: number;
    constructor(startMs: number, base: number, waitFn?: (timeoutMs: number) => Promise<void>);
    backoff(): Promise<void>;
}