Add support to recognise 4004 codes and throw an error

src/client/websocket/WebSocketManager.js

@@ -59,7 +59,7 @@ class WebSocketManager {
      */
     this.ws = new WebSocket(gateway);
     this.ws.onopen = () => this.eventOpen();
-    this.ws.onclose = () => this.eventClose();
+    this.ws.onclose = (d) => this.eventClose(d);
     this.ws.onmessage = (e) => this.eventMessage(e);
     this.ws.onerror = (e) => this.eventError(e);
   }
@@ -126,7 +126,10 @@ class WebSocketManager {
    * Run whenever the connection to the gateway is closed, it will try to reconnect the client.
    * @returns {null}
    */
-  eventClose() {
+  eventClose(event) {
+    if (event.code === 4004) {
+      throw Constants.Errors.BAD_LOGIN;
+    }
     if (!this.reconnecting) {
       this.tryReconnect();
     }

src/util/Constants.js

@@ -66,6 +66,7 @@ exports.Errors = {
   TOOK_TOO_LONG: new Error('something took too long to do'),
   NOT_A_PERMISSION: new Error('that is not a valid permission number'),
   INVALID_RATE_LIMIT_METHOD: new Error('unknown rate limiting method'),
+  BAD_LOGIN: new Error('incorrect login details were provided'),
 };
 
 const API = 'https://discordapp.com/api';