/**
 * Used for backoff in {@link client.TierWithClock.advance}
 */
export declare class Backoff {
    signal?: AbortSignal;
    maxDelay: number;
    maxTotalDelay: number;
    totalDelay: number;
    count: number;
    timer?: ReturnType<typeof setTimeout>;
    resolve?: () => void;
    timedOut: boolean;
    constructor(maxDelay: number, maxTotalDelay: number, { signal }: {
        signal?: AbortSignal;
    });
    abort(): void;
    backoff(): Promise<void>;
}
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