/**
 * Parses a common log format line into structured components.
 * Supports Apache Common Log Format and Combined Log Format.
 *
 * @param logLine - The log line string to parse.
 * @param format - Log format: "common" or "combined" (default: "common").
 * @returns An object containing parsed log components.
 *
 * @throws {Error} If logLine is empty.
 * @throws {Error} If format is not valid.
 * @throws {Error} If log line doesn't match expected format.
 *
 * @example
 * // Common format
 * const line = '127.0.0.1 - frank [10/Oct/2000:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326';
 * parseLogLine(line);
 * // Returns {
 * //   ip: "127.0.0.1",
 * //   identity: "-",
 * //   user: "frank",
 * //   timestamp: "10/Oct/2000:13:55:36 -0700",
 * //   method: "GET",
 * //   path: "/apache_pb.gif",
 * //   protocol: "HTTP/1.0",
 * //   status: 200,
 * //   size: 2326
 * // }
 *
 * @example
 * // Combined format (with referer and user-agent)
 * const line = '127.0.0.1 - - [10/Oct/2000:13:55:36 -0700] "GET / HTTP/1.0" 200 2326 "http://example.com" "Mozilla/5.0"';
 * parseLogLine(line, "combined");
 * // Returns parsed object with additional referer and userAgent fields
 *
 * @note Common format includes: IP, identity, user, timestamp, request, status, size.
 * Combined format adds: referer and user-agent.
 *
 * @complexity Time: O(n), Space: O(1) - Where n is the length of log line
 */
export declare function parseLogLine(logLine: string, format?: 'common' | 'combined'): Record<string, string | number>;
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