/**
 * Error class for failures that should not be retried
 * (e.g., 4xx client errors where the same request will always fail)
 */
export declare class NonRetryableError extends Error {
    readonly statusCode: number;
    constructor(message: string, statusCode: number);
}
export interface RetryOptions {
    maxAttempts: number;
    initialDelay: number;
    maxDelay?: number;
    backoffMultiplier?: number;
}
/**
 * Retry a function with exponential backoff
 */
export declare function withRetry<T>(fn: () => Promise<T>, options: RetryOptions): Promise<T>;
/**
 * Queue for offline-capable requests
 */
export interface RequestQueue<T> {
    add: (item: T) => void;
    process: (processor: (item: T) => Promise<boolean>) => Promise<void>;
    size: () => number;
    clear: () => void;
}
export declare function createRequestQueue<T>(): RequestQueue<T>;