import { type BlossomRetryOptions } from "../types";
import { type Logger } from "./logger";
/**
 * Make an HTTP request with retry capability
 *
 * @param url URL to fetch
 * @param options Fetch options
 * @param retryOptions Retry configuration
 * @param logger Logger instance
 * @returns Fetch response
 */
export declare function fetchWithRetry(url: string, options?: RequestInit, retryOptions?: Partial<BlossomRetryOptions>, logger?: Logger): Promise<Response>;
/**
 * Make a HEAD request to check if a resource exists
 *
 * @param url URL to check
 * @param options Fetch options
 * @param retryOptions Retry configuration
 * @returns true if resource exists (2xx status), false otherwise
 */
export declare function checkResourceExists(url: string, options?: RequestInit, retryOptions?: Partial<BlossomRetryOptions>): Promise<boolean>;
/**
 * Check if a Blossom server has a blob by its hash
 *
 * @param serverUrl Base URL of the server
 * @param hash SHA256 hash of the blob
 * @param retryOptions Retry configuration
 * @returns true if the blob exists, false otherwise
 */
export declare function checkBlobExists(serverUrl: string, hash: string, retryOptions?: Partial<BlossomRetryOptions>): Promise<boolean>;
/**
 * Extract JSON from a response with error handling
 *
 * @param response Fetch Response object
 * @param serverUrl Original server URL for error context
 * @returns Parsed JSON data
 */
export declare function extractResponseJson(response: Response, serverUrl: string): Promise<any>;
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