import type { IClientOptions } from "mqtt";
import Device from "./device/Device.js";
import type { EndpointDefinition } from "./device/Device.js";
import { EventEmitter } from "events";
import { DisplayCategory } from "./compat/enums.js";
import type { Timers } from "./dispatcher.js";
import type { Publisher } from "./transport.js";
/** Optional settings for the bridge (1.5.1). Everything has the 1.4.0 behaviour as its default. */
export interface Alex2MQTTOptions {
    /** The broker URL. Default: the public Alex2MQTT broker, mqtt://Alex2MQTT.stormysdream.club:1883. */
    host?: string;
    /** Extra mqtt.js client options (reconnectPeriod, connectTimeout, clientId, ...). Merged over the defaults. */
    mqtt?: IClientOptions;
    /** Where log lines go. Default: console (only when debugLogging is on). */
    log?: (message: string, detail?: unknown) => void;
    /**
     * false: discovery does not list the Alexa interface on the endpoints. Default: every endpoint ends with
     * { type: "AlexaInterface", interface: "Alexa", version: "3" }, which Amazon requires and 1.x left out.
     */
    alexaInterface?: boolean;
    /**
     * How long a directive may wait for its answer, in milliseconds. After that the bridge answers INTERNAL_ERROR and
     * emits "unanswered". Default: 6500, before Alex2MQTT gives up at 7000. 0: the bridge never answers for a handler.
     */
    answerWithinMs?: number;
    /**
     * true: a directive for an endpoint the bridge does not have is answered with NO_SUCH_ENDPOINT. Default: it is
     * left alone, because the endpoint may belong to another bridge on the same root topic.
     */
    answerUnknownEndpoints?: boolean;
    /** Publish here and not to the broker: a MemoryPublisher and receive() run a bridge that never connects. */
    publisher?: Publisher;
    /** The timer of answerWithinMs, for a test that does not wait. Default: setTimeout, unref'd. */
    timers?: Timers;
}
export declare const DEFAULT_HOST = "mqtt://Alex2MQTT.stormysdream.club:1883";
/**
 * The Alexa-to-MQTT bridge: one broker connection for a user's root topic, a set of registered devices, discovery and
 * directive dispatch.
 *
 * Events (all optional to listen to - since 1.5.1 a broker outage never throws out of the library):
 *   "connect"           connected (or reconnected) and subscribed to <root>/discover and <root>/+/alexaDirective
 *   "offline"           the connection dropped; mqtt.js reconnects on its own (reconnectPeriod, default 1 s)
 *   "reconnect"         a reconnect attempt starts
 *   "close"             the connection closed
 *   "error"   (err)     a connection or publish error. Emitted ONLY when a listener is attached (1.4.0 emitted it
 *                       unconditionally, and Node kills a process that has an unhandled "error" event)
 *   "discover" (n)      a discovery request was answered with n devices
 *   "directive" (info)  a directive was dispatched to a device: { endpointId, namespace, name }
 *   "unknownEndpoint" (info)  a directive came for an endpoint that is not registered: { endpointId, namespace, name }
 *   "unanswered" (info) nothing answered a directive in time and the bridge answered INTERNAL_ERROR:
 *                       { endpointId, namespace, name, correlationToken }
 */
declare class Alex2MQTT extends EventEmitter {
    private username;
    private password;
    private rootTopic;
    private debugLogging;
    private client;
    private readonly publisher;
    private readonly dispatcher;
    private devices;
    private MqttHost;
    private options;
    private logged;
    /** true while the broker connection is up. */
    connected: boolean;
    /** ISO time of the last discovery request answered, null before the first. */
    lastDiscoveryAt: string | null;
    constructor(username: string, password: string, rootTopic: string, debugLogging?: boolean, options?: Alex2MQTTOptions);
    private log;
    /** Emit "error" only when somebody listens: an unhandled "error" event would crash the host process. */
    private fail;
    connect(): void;
    /**
     * What the bridge does with a message of the broker: it answers a discovery request, and it hands a directive to
     * the handlers of its device. Resolves when they are done and never rejects. With the publisher option a test
     * calls it in place of the broker:
     *
     *   await bridge.receive("root/lamp-1/alexaDirective", JSON.stringify(directive));
     */
    receive(topic: string, payload: Buffer | string): Promise<void>;
    private answerDiscovery;
    private describeDevices;
    /** Close the broker connection (resolves once closed). The devices stay registered; connect() again reuses them. */
    disconnect(): Promise<void>;
    /**
     * Declare a device:
     *
     *   const blinds = bridge.addDevice({ endpointId: "bedroom-blinds", name: "Bedroom Blinds",
     *     categories: ["INTERIOR_BLIND"], manufacturerName: "Acme", description: "Roller blind by Acme" });
     *
     * Throws a DeclarationError when Alexa would reject the endpoint (an endpointId with a slash, a name with
     * punctuation) or when the endpointId is registered already. Discovery lists Alexa.EndpointHealth for the device
     * unless endpointHealth is false. A device can be declared before connect(): what it sends before the bridge has
     * a connection is not published, and the "error" event says so.
     */
    addDevice(definition: EndpointDefinition): Device;
    registerDevice(name: string, endpointId: string, displayCategory?: DisplayCategory | DisplayCategory[] | null): Device;
    private register;
    /** Forget a device (its listeners with it). Returns false when there was none. */
    unregisterDevice(endpointId: string): boolean;
    /** Forget every device. */
    clearDevices(): void;
    private release;
    getDevices(): Device[];
    getDevice(endpointId: string): Device | undefined;
    getRootTopic(): string;
    getHost(): string;
}
export default Alex2MQTT;