export declare function isValidUrl(urlString: string): boolean;
export declare function findAvailablePort(startPort?: number, maxAttempts?: number): Promise<number>;
/**
 * Determines whether the given TCP port is available for binding on the local machine.
 *
 * @param port - The port number to check (1–65535)
 * @returns `true` if the port can be bound (is available), `false` otherwise
 */
export declare function isPortAvailable(port: number): Promise<boolean>;
/**
 * Parses a TCP port number from command-line arguments using the `--port` flag.
 *
 * If `--port` is present and followed by an integer between 1 and 65535, returns that port.
 *
 * @returns The parsed port number if valid, `null` if the flag is missing or the value is invalid.
 */
export declare function parsePortFromArgs(): number | null;
/**
 * Checks if the `--no-open` flag is present in command-line arguments.
 *
 * @returns `true` if `--no-open` is present, `false` otherwise.
 */
export declare function hasNoOpenFlag(): boolean;
/**
 * Helper function to format error responses with context and timestamp
 */
export declare function formatErrorResponse(error: unknown, context: string): {
    stack?: string | undefined;
    error: string;
    context: string;
    timestamp: string;
};
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