chore: clean up listener creation

packages/entity/traits/graphical.js

@@ -28,23 +28,22 @@ class GraphicalBase extends Trait {
   }
 
   listeners() {
+    const listeners = {};
     const trackPosition = this.params.get('trackPosition');
-    if (!trackPosition || !this._container.isValid) {
-      return {};
-    }
-    return {
-      traitAdded: (trait) => {
+    if (trackPosition && this._container.isValid) {
+      listeners.traitAdded = (trait) => {
         if ('positioned' === trait.constructor.type()) {
           this._container.position = this.entity.position;
         }
-      },
-      xChanged: (x) => {
+      };
+      listeners.xChanged = (x) => {
         this._container.x = x;
-      },
-      yChanged: (y) => {
+      };
+      listeners.yChanged = (y) => {
         this._container.y = y;
-      },
+      };
     }
+    return listeners;
   }
 
 }