/**
 * Fetch utilities with retries, timeouts, and keep-alive.
 *
 * @module fetch-utils
 */
export interface FetchOptions {
    /** Request timeout in milliseconds. */
    timeoutMs?: number;
    /** Maximum number of retries. */
    maxRetries?: number;
    /** Delay between retries in milliseconds. */
    retryDelayMs?: number;
    /** Custom headers. */
    headers?: Record<string, string>;
    /** HTTP method. */
    method?: "GET" | "POST" | "HEAD";
    /** Request body for POST. */
    body?: string;
    /** Use cache. */
    useCache?: boolean;
    /** Cache TTL in milliseconds. */
    cacheTtlMs?: number;
    /** Abort signal. */
    signal?: AbortSignal;
}
export interface FetchResult {
    /** Response body as text. */
    text: string;
    /** HTTP status code. */
    status: number;
    /** Response headers. */
    headers: Headers;
    /** Final URL after redirects. */
    url: string;
}
export declare class FetchError extends Error {
    readonly status?: number | undefined;
    readonly url?: string | undefined;
    constructor(message: string, status?: number | undefined, url?: string | undefined);
}
/**
 * Fetch a URL with retries, timeout, and caching.
 */
export declare function fetchWithRetry(url: string, options?: FetchOptions): Promise<FetchResult>;
/**
 * Check if a URL is reachable.
 */
export declare function isReachable(url: string, timeoutMs?: number): Promise<boolean>;
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