export type BackoffOptions = {
    /** Base delay used for attempt #1 (ms). */
    baseDelayMs: number;
    /** Hard cap on the scheduled delay (ms). */
    maxDelayMs: number;
    /** Growth multiplier applied per attempt. */
    multiplier: number;
    /** Symmetric jitter ratio in [0, 1]. */
    jitterRatio: number;
};
/**
 * Compute an exponentially-growing, jittered delay for a given attempt.
 *
 * `attempt` is 1-based:
 *   - attempt 1 → `baseDelayMs` (with jitter).
 *   - attempt n → min(baseDelayMs * multiplier^(n-1), maxDelayMs) ± jitter.
 *
 * Setting `baseDelayMs` to 0 yields an instant first attempt; subsequent
 * attempts remain 0 unless the caller changes `baseDelayMs`.
 */
export declare const computeBackoffMs: (attempt: number, opts: BackoffOptions) => number;