import { ResourceRecord, ResourceType } from "../decode/types.js";
import { MulticastInterface } from "./multicast_interface.js";
export type MdnsQuestion = {
    name: string;
    recordType: ResourceType;
};
/** A continuous multicast DNS query.
 *
 * Reports additions, flushes, and expirations of resource records answering the given query via an asynchronous iterator:
 *
 * ```ts
 * const query = new Query(
 *   [{ name: '_http._tcp.local', recordType: 255 }],
 *   multicastInterface: new MulticastInterface()
 * );
 *
 * for await (const event of query) {
 *   console.log(event)
 * }
 * ```
 */
export declare class Query {
    private questions;
    private minterface;
    private recordCache;
    private scheduled;
    private ended;
    private suppressedQuestions;
    private additionalRecords;
    constructor(questions: MdnsQuestion[], multicastInterface: MulticastInterface);
    private scheduleInitialQuery;
    private scheduleFurtherQueries;
    /** Gets all questions given to this Query which we do not already know the answer to, and which we have not recently seen asked by anyone else via multicast. */
    private getQuestions;
    private scheduleQuery;
    private handleQuery;
    private askedQuestionFor;
    private handleResponse;
    /** Sends a DNS query with given questions.
     *
     * If no questions are provided, uses the ones given to the `Query` at construction.
     */
    private sendQuery;
    /** All answers obtained over the life of this query. */
    answers(): ResourceRecord[];
    /** All additional records obtained from responses which had valid answers in them. */
    additional(): ResourceRecord[];
    /** Stop this query from running. */
    end(): void;
    [Symbol.asyncIterator](): AsyncGenerator<QueryCacheEvent, void, unknown>;
}
export type QueryCacheEvent = {
    kind: "ADDED" | "EXPIRED" | "FLUSHED";
    record: ResourceRecord;
};