/**
 * Configuration for exponential backoff retry logic.
 */
export type BackoffConfig = {
    maxRetries: number;
    baseDelayInMs: number;
    backoffFactor: number;
    errHandler?: (error: Error, attempt: number) => 'stop' | 'continue';
};
/**
 * Checks if an error is safe to retry.
 * Only transient errors matching the allowlist should return true.
 * All other errors fail fast to avoid masking security-critical failures.
 *
 * @param error - The error to check
 * @returns true if the error is transient and safe to retry, false otherwise
 */
export declare function isRetryableError(error: Error): boolean;
/**
 * Default error handler that only retries known transient errors.
 * Security-critical errors will fail fast.
 */
export declare function defaultRetryErrorHandler(error: Error): 'stop' | 'continue';
/**
 * Helper function to implement exponential backoff retry logic.
 * @param fn - The function to retry
 * @param config - Optional backoff configuration
 * @returns Promise that resolves with the result of the function
 */
export declare function retryWithBackoff<T>(fn: () => Promise<T>, { maxRetries, baseDelayInMs, backoffFactor, errHandler, }?: Partial<BackoffConfig>): Promise<T>;