Implement WebSocketServer Adapter (#5866)

* Implement WebSocketServerAdapter

* lint

* clean up

src/Adapters/WebSocketServer/WSAdapter.js

@@ -0,0 +1,22 @@
+/*eslint no-unused-vars: "off"*/
+import { WSSAdapter } from './WSSAdapter';
+const WebSocketServer = require('ws').Server;
+
+/**
+ * Wrapper for ws node module
+ */
+export class WSAdapter extends WSSAdapter {
+  constructor(options: any) {
+    super(options);
+    const wss = new WebSocketServer({ server: options.server });
+    wss.on('listening', this.onListen);
+    wss.on('connection', this.onConnection);
+  }
+
+  onListen() {}
+  onConnection(ws) {}
+  start() {}
+  close() {}
+}
+
+export default WSAdapter;