export interface RetryPlatform {
    setTimeout(fn: () => void, delay: number): ReturnType<typeof setTimeout>;
    clearTimeout(timer: ReturnType<typeof setTimeout>): void;
}
export interface RetrySchedulerOptions {
    retries: number;
    retryDelay: number;
    platform?: RetryPlatform;
}
export interface RetryScheduler {
    /** Returns the attempt number a settle would resolve to, without mutating state. */
    attemptOf(tag: string): number;
    /**
     * Records a failed attempt. If retries are not exhausted, schedules `retry`
     * via the platform timer with exponential backoff. Returns the attempt number
     * just used and whether another retry is queued.
     */
    scheduleRetry(tag: string, retry: () => void): {
        willRetry: boolean;
        attempt: number;
    };
    /** Cancel any pending retry timer and forget the attempt count for one tag. */
    cancel(tag: string): void;
    /** Cancel everything. */
    cancelAll(): void;
}
export declare function createRetryScheduler(options: RetrySchedulerOptions): RetryScheduler;