/**
 * Represents a network service type with optional protocol and subtype.
 */
export declare class ServiceType {
    readonly name?: string;
    readonly protocol?: string;
    readonly subtype?: string;
    constructor(name?: string, protocol?: string, subtype?: string);
    /**
     * Parses a service type string into a ServiceType instance.
     *
     * Expected formats include:
     * - "_http._tcp"
     * - "_printer._sub._http._tcp" (a subtype "printer" of "_http._tcp")
     *
     * @param {string} input - The service type string to parse.
     * @returns {ServiceType} The parsed ServiceType instance.
     *
     * @example
     * ServiceType.fromString('_http._tcp');
     * // { name: "http", protocol: "tcp", subtype: undefined }
     *
     * ServiceType.fromString('_printer._sub._http._tcp');
     * // { name: "http", protocol: "tcp", subtype: "printer" }
     *
     * @see {@link https://datatracker.ietf.org/doc/html/rfc6763#section-7.1 | RFC 6763 §7.1 Selective Instance Enumeration (Subtypes)}
     */
    static fromString(input: string): ServiceType;
    /**
     * Serializes the ServiceType instance into a string following DNS-SD format.
     *
     * @returns {string} The serialized service type string.
     *
     * @example
     * const svc = new ServiceType('http', 'tcp');
     * console.log(svc.toString()); // _http._tcp
     *
     * const svcWithSubtype = new ServiceType('http', 'tcp', 'printer');
     * console.log(svcWithSubtype.toString()); // _printer._sub._http._tcp
     */
    toString(): string;
}