Provide WsRouter to plugins

test/test-plugin/src/index.ts

@@ -1,5 +1,8 @@
 import * as cs from "code-server"
 import * as fspath from "path"
+import Websocket from "ws"
+
+const wss = new Websocket.Server({ noServer: true })
 
 export const plugin: cs.Plugin = {
   displayName: "Test Plugin",
@@ -22,6 +25,16 @@ export const plugin: cs.Plugin = {
     return r
   },
 
+  wsRouter() {
+    const wr = cs.WsRouter()
+    wr.ws("/test-app", (req) => {
+      wss.handleUpgrade(req, req.socket, req.head, (ws) => {
+        ws.send("hello")
+      })
+    })
+    return wr
+  },
+
   applications() {
     return [
       {