Added 'error' TransportEvent option

src/index.ts

@@ -587,6 +587,7 @@ export class DCRFClient implements IStreamingAPI {
     this.queue.processQueue();
   }
 
+
   public buildMultiplexedMessage(stream: string, payload: object): object {
     return { stream, payload };
   }

src/interface.ts

@@ -1,4 +1,4 @@
-import { Options as ReconnectingWebsocketOptions } from 'reconnecting-websocket';
+import ReconnectingWebSocket, { Options as ReconnectingWebsocketOptions } from 'reconnecting-websocket';
 import { Logger } from 'winston';
 
 export
@@ -111,6 +111,7 @@ export type TransportEvent = 'open' | 'connect' | 'reconnect' | 'message' | 'err
 
 export
 interface ITransport {
+
   /**
    * Initiate the transport's connection
    *
@@ -140,6 +141,7 @@ interface ITransport {
    *  - "connect": on initial connection
    *  - "reconnect": when the connection is lost, then reestablished
    *  - "message": when a message is received
+   *  - "error": when an error occurs
    */
   on(name: TransportEvent, handler: (...args: any) => void): any | null;
 

src/transports/websocket.ts

@@ -46,6 +46,7 @@ export class WebsocketTransport extends EventEmitter implements ITransport {
 
     this.socket.addEventListener("message", this.handleMessage);
     this.socket.addEventListener("open", this.handleOpen);
+    this.socket.addEventListener("error", this.handleError);
 
     return true;
   }
@@ -79,6 +80,11 @@ export class WebsocketTransport extends EventEmitter implements ITransport {
     this.socket.send(bytes);
   }
 
+  @autobind
+  protected handleError(event: Event) {
+    this.emit("error", event);
+  }
+
   @autobind
   protected handleMessage(event: Event) {
     this.emit("message", event);