/**
 * Fetch with timeout to prevent hanging requests
 *
 * This utility wraps the native fetch API with an AbortController to ensure
 * requests don't hang indefinitely. This is critical for OAuth token operations
 * where expired tokens might cause Google's servers to hang or respond slowly.
 *
 * @param url - URL to fetch
 * @param options - Fetch options
 * @param timeoutMs - Timeout in milliseconds (default: 30000)
 * @returns Fetch response
 * @throws Error if request times out
 */
export declare function fetchWithTimeout(url: string, options?: RequestInit, timeoutMs?: number): Promise<Response>;