Метод #run класса App сделан приватным

examples/simple_scene/game.js

@@ -1,4 +1,4 @@
-import * as ujs from './engine.js';
+import * as ujs from './ujs.js';
 
 let app = new ujs.App(400, 400);
 

examples/simple_scene/ujs.js

@@ -0,0 +1 @@
+../../dist/ujs.js

rollup.config.js

@@ -1,15 +1,14 @@
 import terser from '@rollup/plugin-terser';
-import pkg from './package.json' assert { type: 'json' };
 
 export default {
   input: 'src/main.js',
   output: [
     {
-      file: `dist/engine-${pkg.version}.js`,
+      file: `dist/ujs.js`,
       format: 'es',
     },
     {
-      file: `dist/engine-${pkg.version}.min.js`,
+      file: `dist/ujs.min.js`,
       format: 'es',
       plugins: [terser()],
     },

src/main.js

@@ -49,10 +49,10 @@ export class App {
     Settings.fpsPrevTime = Date.now();
 
     // Start :)
-    this.run();
+    this.#run();
   }
 
-  run = () => {
+  #run = () => {
     // Calculating FPS
     let fpsNewTime = Date.now();
     Settings.fpsDelta = (fpsNewTime - Settings.fpsPrevTime) / 1000;
@@ -69,7 +69,7 @@ export class App {
     // Draw scene
     this.scene.run();
 
-    requestAnimationFrame(this.run);
+    requestAnimationFrame(this.#run);
   };
 }