/**
 * Exponential backoff with jitter. Used internally by the client; exported
 * because consumers occasionally want to wrap their own retries with the
 * same policy.
 */
export interface RetryPolicy {
    maxRetries: number;
    /** Base delay in ms. Defaults to 200. */
    baseDelayMs?: number;
    /** Cap on a single delay in ms. Defaults to 4000. */
    maxDelayMs?: number;
}
/**
 * Compute the delay before retry attempt `attempt` (0-indexed: 0 = first retry).
 * Adds ±25% jitter so callers don't thunder.
 *
 * For testability, an optional `random` function can be passed; defaults to Math.random.
 */
export declare function backoffDelayMs(attempt: number, policy: RetryPolicy, random?: () => number): number;
export declare function sleep(ms: number, signal?: AbortSignal): Promise<void>;
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