Upload 4 files

src/app.config.ts

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+import config from "@colyseus/tools";
+import { monitor } from "@colyseus/monitor";
+import { playground } from "@colyseus/playground";
+
+/**
+ * Import your Room files
+ */
+import { MyRoom } from "./rooms/MyRoom";
+
+export default config({
+
+    initializeGameServer: (gameServer) => {
+        /**
+         * Define your room handlers:
+         */
+        gameServer.define('my_room', MyRoom);
+
+    },
+
+    initializeExpress: (app) => {
+        /**
+         * Bind your custom express routes here:
+         * Read more: https://expressjs.com/en/starter/basic-routing.html
+         */
+        app.get("/hello_world", (req, res) => {
+            res.send("It's time to kick ass and chew bubblegum!");
+        });
+
+        /**
+         * Use @colyseus/playground
+         * (It is not recommended to expose this route in a production environment)
+         */
+        if (process.env.NODE_ENV !== "production") {
+            app.use("/", playground);
+        }
+
+        /**
+         * Use @colyseus/monitor
+         * It is recommended to protect this route with a password
+         * Read more: https://docs.colyseus.io/tools/monitor/#restrict-access-to-the-panel-using-a-password
+         */
+        app.use("/colyseus", monitor());
+    },
+
+
+    beforeListen: () => {
+        /**
+         * Before before gameServer.listen() is called.
+         */
+    }
+});

src/index.ts

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+/**
+ * IMPORTANT:
+ * ---------
+ * Do not manually edit this file if you'd like to host your server on Colyseus Cloud
+ *
+ * If you're self-hosting (without Colyseus Cloud), you can manually
+ * instantiate a Colyseus Server as documented here:
+ *
+ * See: https://docs.colyseus.io/server/api/#constructor-options
+ */
+import { listen } from "@colyseus/tools";
+
+// Import Colyseus config
+import app from "./app.config";
+
+// Create and listen on 2567 (or PORT environment variable.)
+listen(app);

src/rooms/MyRoom.ts

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+import { Room, Client } from "@colyseus/core";
+import { MyRoomState } from "./schema/MyRoomState";
+
+export class MyRoom extends Room<MyRoomState> {
+  maxClients = 4;
+
+  onCreate (options: any) {
+    this.setState(new MyRoomState());
+
+    this.onMessage("type", (client, message) => {
+      //
+      // handle "type" message
+      //
+    });
+  }
+
+  onJoin (client: Client, options: any) {
+    console.log(client.sessionId, "joined!");
+  }
+
+  onLeave (client: Client, consented: boolean) {
+    console.log(client.sessionId, "left!");
+  }
+
+  onDispose() {
+    console.log("room", this.roomId, "disposing...");
+  }
+
+}

src/rooms/schema/MyRoomState.ts

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+import { Schema, Context, type } from "@colyseus/schema";
+
+export class MyRoomState extends Schema {
+
+  @type("string") mySynchronizedProperty: string = "Hello world";
+
+}