/**
 * Exponential backoff retry utility.
 */
export interface RetryOptions {
    maxAttempts?: number;
    baseDelayMs?: number;
    /** Return true if the error is retryable. Default: always retry. */
    shouldRetry?: (err: unknown, attempt: number) => boolean;
}
/**
 * Execute fn with exponential backoff. Delays: 1s, 2s, 4s (with ±20% jitter).
 * Throws the last error if all attempts fail.
 */
export declare function withRetry<T>(fn: () => Promise<T>, opts?: RetryOptions): Promise<T>;
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