/**
 * Default progressive delays used for rate-limit retries:
 * 1 minute, 2 minutes, 5 minutes, 10 minutes, and 30 minutes.
 */
export declare const DEFAULT_PROGRESSIVE_BACKOFF_DELAYS_MS: readonly number[];
/**
 * Options for one progressive backoff counter.
 */
export type ProgressiveBackoffOptions = {
    delaysMs?: readonly number[];
    maxDelayMs?: number;
    jitterRatio?: number;
    random?: () => number;
};
/**
 * Stateful progressive backoff counter with optional jitter and capped maximum delay.
 */
export declare class ProgressiveBackoff {
    private readonly delaysMs;
    private readonly maxDelayMs;
    private readonly jitterRatio;
    private readonly random;
    private failuresSinceSuccess;
    /**
     * Creates one progressive backoff counter.
     */
    constructor(options?: ProgressiveBackoffOptions);
    /**
     * Number of consecutive failures since the last successful reset.
     */
    get retryCount(): number;
    /**
     * Returns the next delay and advances the backoff counter by one failed attempt.
     */
    nextDelayMs(): number;
    /**
     * Resets backoff state after one successful call.
     */
    reset(): void;
    /**
     * Resolves the non-jittered delay for the given retry index.
     */
    private resolveBaseDelayMs;
}