feat: action ack

app/net/packets/action-ack.js

@@ -0,0 +1,3 @@
+import Packet from '@/net/packet.js';
+
+export default class ActionAck extends Packet {}

app/server/engine.js

@@ -249,6 +249,17 @@ export default class Engine {
             break;
           }
         }
+        if (payload.ack) {
+          this.server.send(
+            connection,
+            {
+              type: 'ActionAck',
+              payload: {
+                ack: payload.ack,
+              },
+            },
+          );
+        }
       }
       this.incomingActions.set(connection, []);
     }