/**
 * Browser specific MQTT5 client implementation
 *
 * [MQTT5 Client User Guide](https://www.github.com/awslabs/aws-crt-nodejs/blob/main/MQTT5-UserGuide.md)
 *
 * @packageDocumentation
 * @module mqtt5
 * @mergeTarget
 *
 */
import { BufferedEventEmitter } from "../common/event";
import * as mqtt5 from "../common/mqtt5";
import * as mqtt5_packet from "../common/mqtt5_packet";
import * as auth from "./auth";
export * from "../common/mqtt5";
export * from '../common/mqtt5_packet';
/**
 * Factory function that allows the user to completely control the url used to form the websocket handshake
 * request.
 */
export type Mqtt5WebsocketUrlFactory = () => string;
/**
 * Type of url to construct when establishing an MQTT5 connection over websockets
 */
export declare enum Mqtt5WebsocketUrlFactoryType {
    /**
     * Websocket connection over plain-text with no additional handshake transformation
     */
    Ws = 1,
    /**
     * Websocket connection over TLS with no additional handshake transformation
     */
    Wss = 2,
    /**
     * Websocket connection over TLS with a handshake signed by the Aws Sigv4 signing process
     */
    Sigv4 = 3,
    /**
     * Websocket connection whose url is formed by a user-supplied callback function
     */
    Custom = 4
}
/**
 * Websocket factory options discriminated union variant for untransformed connections over plain-text
 */
export interface Mqtt5WebsocketUrlFactoryWsOptions {
    urlFactory: Mqtt5WebsocketUrlFactoryType.Ws;
}
/**
 * Websocket factory options discriminated union variant for untransformed connections over TLS
 */
export interface Mqtt5WebsocketUrlFactoryWssOptions {
    urlFactory: Mqtt5WebsocketUrlFactoryType.Wss;
}
/**
 * Websocket factory options discriminated union variant for untransformed connections over TLS signed by
 * the AWS Sigv4 signing process.
 */
export interface Mqtt5WebsocketUrlFactorySigv4Options {
    urlFactory: Mqtt5WebsocketUrlFactoryType.Sigv4;
    /**
     * AWS Region to sign against.
     */
    region?: string;
    /**
     * Provider to source AWS credentials from
     */
    credentialsProvider: auth.CredentialsProvider;
}
/**
 * Websocket factory options discriminated union variant for arbitrarily transformed handshake urls.
 */
export interface Mqtt5WebsocketUrlFactoryCustomOptions {
    urlFactory: Mqtt5WebsocketUrlFactoryType.Custom;
    customUrlFactory: Mqtt5WebsocketUrlFactory;
}
/**
 * Union of all websocket factory option possibilities.
 */
export type Mqtt5WebsocketUrlFactoryOptions = Mqtt5WebsocketUrlFactoryWsOptions | Mqtt5WebsocketUrlFactoryWssOptions | Mqtt5WebsocketUrlFactorySigv4Options | Mqtt5WebsocketUrlFactoryCustomOptions;
/**
 * Browser-specific websocket configuration options for connection establishment
 */
export interface Mqtt5WebsocketConfig {
    /**
     * Options determining how the websocket url is created.
     */
    urlFactoryOptions: Mqtt5WebsocketUrlFactoryOptions;
    /**
     * Opaque options set passed through to the underlying websocket implementation regardless of url factory.
     * Use this to control proxy settings amongst other things.
     */
    wsOptions?: any;
}
/**
 * Configuration options for mqtt5 client creation.
 */
export interface Mqtt5ClientConfig {
    /**
     * Host name of the MQTT server to connect to.
     */
    hostName: string;
    /**
     * Network port of the MQTT server to connect to.
     */
    port: number;
    /**
     * Controls how the MQTT5 client should behave with respect to MQTT sessions.
     */
    sessionBehavior?: mqtt5.ClientSessionBehavior;
    /**
     * Controls how the reconnect delay is modified in order to smooth out the distribution of reconnection attempt
     * timepoints for a large set of reconnecting clients.
     */
    retryJitterMode?: mqtt5.RetryJitterType;
    /**
     * Minimum amount of time to wait to reconnect after a disconnect.  Exponential backoff is performed with jitter
     * after each connection failure.
     */
    minReconnectDelayMs?: number;
    /**
     * Maximum amount of time to wait to reconnect after a disconnect.  Exponential backoff is performed with jitter
     * after each connection failure.
     */
    maxReconnectDelayMs?: number;
    /**
     * Amount of time that must elapse with an established connection before the reconnect delay is reset to the minimum.
     * This helps alleviate bandwidth-waste in fast reconnect cycles due to permission failures on operations.
     */
    minConnectedTimeToResetReconnectDelayMs?: number;
    /**
     * All configurable options with respect to the CONNECT packet sent by the client, including the will.  These
     * connect properties will be used for every connection attempt made by the client.
     */
    connectProperties?: mqtt5_packet.ConnectPacket;
    /**
     * Overall time interval to wait to establish an MQTT connection.  If a complete MQTT connection (from socket
     * establishment all the way up to CONNACK receipt) has not been established before this timeout expires,
     * the connection attempt will be considered a failure.
     */
    connectTimeoutMs?: number;
    /**
     * Additional controls for client behavior with respect to topic alias usage.
     *
     * If this setting is left undefined, then topic aliasing behavior will be disabled.
     */
    topicAliasingOptions?: mqtt5.TopicAliasingOptions;
    /**
     * Options for the underlying websocket connection
     *
     * @group Browser-only
     */
    websocketOptions?: Mqtt5WebsocketConfig;
}
/**
 * Browser specific MQTT5 client implementation
 *
 * [MQTT5 Client User Guide](https://www.github.com/awslabs/aws-crt-nodejs/blob/main/MQTT5-UserGuide.md)
 */
export declare class Mqtt5Client extends BufferedEventEmitter implements mqtt5.IMqtt5Client {
    private config;
    private browserClient?;
    private state;
    private lifecycleEventState;
    private lastDisconnect?;
    private lastError?;
    private reconnectionScheduler?;
    private mqttJsConfig;
    private topicAliasBindings;
    /**
     * Client constructor
     *
     * @param config The configuration for this client
     */
    constructor(config: Mqtt5ClientConfig);
    /**
     * Triggers cleanup of native resources associated with the MQTT5 client.  On the browser, the implementation is
     * an empty function.
     */
    close(): void;
    /**
     * Notifies the MQTT5 client that you want it to maintain connectivity to the configured endpoint.
     * The client will attempt to stay connected using the properties of the reconnect-related parameters
     * in the mqtt5 client configuration.
     *
     * This is an asynchronous operation.
     */
    start(): void;
    /**
     * Notifies the MQTT5 client that you want it to end connectivity to the configured endpoint, disconnecting any
     * existing connection and halting reconnection attempts.
     *
     * This is an asynchronous operation.  Once the process completes, no further events will be emitted until the client
     * has {@link start} invoked.  Invoking {@link start start()} after a {@link stop stop()} will always result in
     * a new MQTT session.
     *
     * @param disconnectPacket (optional) properties of a DISCONNECT packet to send as part of the shutdown process
     */
    stop(disconnectPacket?: mqtt5_packet.DisconnectPacket): void;
    /**
     * Subscribe to one or more topic filters by queuing a SUBSCRIBE packet to be sent to the server.
     *
     * @param packet SUBSCRIBE packet to send to the server
     * @returns a promise that will be rejected with an error or resolved with the SUBACK response
     */
    subscribe(packet: mqtt5_packet.SubscribePacket): Promise<mqtt5_packet.SubackPacket>;
    /**
     * Unsubscribe from one or more topic filters by queuing an UNSUBSCRIBE packet to be sent to the server.
     *
     * @param packet UNSUBSCRIBE packet to send to the server
     * @returns a promise that will be rejected with an error or resolved with the UNSUBACK response
     */
    unsubscribe(packet: mqtt5_packet.UnsubscribePacket): Promise<mqtt5_packet.UnsubackPacket>;
    private reset_topic_aliases;
    private bind_topic_alias;
    private is_topic_alias_bound;
    /**
     * Send a message to subscribing clients by queuing a PUBLISH packet to be sent to the server.
     *
     * @param packet PUBLISH packet to send to the server
     * @returns a promise that will be rejected with an error or resolved with the PUBACK response (QoS 1), or
     * undefined (QoS 0)
     */
    publish(packet: mqtt5_packet.PublishPacket): Promise<mqtt5.PublishCompletionResult>;
    /**
     * Queries whether the client is currently connected
     *
     * @returns whether the client is currently connected
     */
    isConnected(): boolean;
    /**
     * Event emitted when the client encounters a disruptive error condition.  Not currently used.
     *
     * Listener type: {@link ErrorEventListener}
     *
     * @event
     */
    static ERROR: string;
    /**
     * Event emitted when the client encounters a transient error event that will not disrupt promises based on
     * lifecycle events.  Currently, mqtt-js client error events are relayed to this event.
     *
     * Listener type: {@link ErrorEventListener}
     *
     * @event
     * @group Browser-only
     */
    static INFO: string;
    /**
     * Event emitted when an MQTT PUBLISH packet is received by the client.
     *
     * Listener type: {@link MessageReceivedEventListener}
     *
     * @event
     */
    static MESSAGE_RECEIVED: string;
    /**
     * Event emitted when the client begins a connection attempt.
     *
     * Listener type: {@link AttemptingConnectEventListener}
     *
     * @event
     */
    static ATTEMPTING_CONNECT: string;
    /**
     * Event emitted when the client successfully establishes an MQTT connection.  Only emitted after
     * an {@link ATTEMPTING_CONNECT attemptingConnect} event.
     *
     * Listener type: {@link ConnectionSuccessEventListener}
     *
     * @event
     */
    static CONNECTION_SUCCESS: string;
    /**
     * Event emitted when the client fails to establish an MQTT connection.  Only emitted after
     * an {@link ATTEMPTING_CONNECT attemptingConnect} event.
     *
     * Listener type: {@link ConnectionFailureEventListener}
     *
     * @event
     */
    static CONNECTION_FAILURE: string;
    /**
     * Event emitted when the client's current connection is closed for any reason.  Only emitted after
     * a {@link CONNECTION_SUCCESS connectionSuccess} event.
     *
     * Listener type: {@link DisconnectionEventListener}
     *
     * @event
     */
    static DISCONNECTION: string;
    /**
     * Event emitted when the client finishes shutdown as a result of the user invoking {@link stop}.
     *
     * Listener type: {@link StoppedEventListener}
     *
     * @event
     */
    static STOPPED: string;
    /**
     * Registers a listener for the client's {@link ERROR error} event.  An {@link ERROR error} event is emitted when
     * the client encounters a disruptive error condition.
     *
     * @param event the type of event to listen to
     * @param listener the event listener to add
     */
    on(event: 'error', listener: mqtt5.ErrorEventListener): this;
    /**
     * Registers a listener for the client's {@link INFO info} event.  An {@link INFO info} event is emitted when
     * the client encounters a transient error event that will not disrupt promises based on lifecycle events.
     * Currently, mqtt-js client error events are relayed to this event.
     *
     * @param event the type of event to listen to
     * @param listener the event listener to add
     *
     * @group Browser-only
     */
    on(event: 'info', listener: mqtt5.ErrorEventListener): this;
    /**
     * Registers a listener for the client's {@link MESSAGE_RECEIVED messageReceived} event.  A
     * {@link MESSAGE_RECEIVED messageReceived} event is emitted when an MQTT PUBLISH packet is received by the
     * client.
     *
     * @param event the type of event to listen to
     * @param listener the event listener to add
     */
    on(event: 'messageReceived', listener: mqtt5.MessageReceivedEventListener): this;
    /**
     * Registers a listener for the client's {@link ATTEMPTING_CONNECT attemptingConnect} event.  A
     * {@link ATTEMPTING_CONNECT attemptingConnect} event is emitted every time the client begins a connection attempt.
     *
     * @param event the type of event to listen to
     * @param listener the event listener to add
     */
    on(event: 'attemptingConnect', listener: mqtt5.AttemptingConnectEventListener): this;
    /**
     * Registers a listener for the client's {@link CONNECTION_SUCCESS connectionSuccess} event.  A
     * {@link CONNECTION_SUCCESS connectionSuccess} event is emitted every time the client successfully establishes
     * an MQTT connection.
     *
     * @param event the type of event to listen to
     * @param listener the event listener to add
     */
    on(event: 'connectionSuccess', listener: mqtt5.ConnectionSuccessEventListener): this;
    /**
     * Registers a listener for the client's {@link CONNECTION_FAILURE connectionFailure} event.  A
     * {@link CONNECTION_FAILURE connectionFailure} event is emitted every time the client fails to establish an
     * MQTT connection.
     *
     * @param event the type of event to listen to
     * @param listener the event listener to add
     */
    on(event: 'connectionFailure', listener: mqtt5.ConnectionFailureEventListener): this;
    /**
     * Registers a listener for the client's {@link DISCONNECTION disconnection} event.  A
     * {@link DISCONNECTION disconnection} event is emitted when the client's current MQTT connection is closed
     * for any reason.
     *
     * @param event the type of event to listen to
     * @param listener the event listener to add
     */
    on(event: 'disconnection', listener: mqtt5.DisconnectionEventListener): this;
    /**
     * Registers a listener for the client's {@link STOPPED stopped} event.  A
     * {@link STOPPED stopped} event is emitted when the client finishes shutdown as a
     * result of the user invoking {@link stop}.
     *
     * @param event the type of event to listen to
     * @param listener the event listener to add
     */
    on(event: 'stopped', listener: mqtt5.StoppedEventListener): this;
    private on_browser_disconnect_packet;
    private on_browser_close;
    private on_browser_client_error;
    private on_attempting_connect;
    private on_connection_success;
    private _on_stopped_internal;
    private on_message;
}