/**
 * Retry utility with exponential backoff and jitter.
 *
 * Features:
 * - Exponential backoff with random jitter
 * - Configurable max retries
 * - Retry on specific status codes and network errors
 * - Respect Retry-After header from 429 responses
 * - Progress callback for logging
 */
export interface RetryOptions {
    /**
     * Maximum number of retry attempts (default: 3)
     */
    maxRetries?: number;
    /**
     * Initial delay in milliseconds before first retry (default: 1000)
     */
    initialDelayMs?: number;
    /**
     * Maximum delay in milliseconds (default: 30000)
     */
    maxDelayMs?: number;
    /**
     * HTTP status codes that should trigger a retry (default: [429, 503, 504])
     */
    retryableStatusCodes?: number[];
    /**
     * Callback invoked before each retry attempt
     * @param attempt - Current attempt number (1-indexed)
     * @param error - The error that triggered the retry
     * @param delayMs - Calculated delay before retry in milliseconds
     */
    onRetry?: (attempt: number, error: Error, delayMs: number) => void;
}
/**
 * Retry an async operation with exponential backoff.
 *
 * @param operation - Async function to retry
 * @param options - Retry configuration options
 * @returns Promise resolving to operation result
 * @throws Last error if all retries exhausted
 *
 * @example
 * ```typescript
 * const result = await retryWithBackoff(
 *   () => fetchClient.get('/api/resource'),
 *   {
 *     maxRetries: 3,
 *     onRetry: (attempt, error, delay) => {
 *       console.log(`Retry ${attempt} after ${delay}ms: ${error.message}`);
 *     }
 *   }
 * );
 * ```
 */
export declare function retryWithBackoff<T>(operation: () => Promise<T>, options?: RetryOptions): Promise<T>;
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