Few Suggestions

[gnansai]

Hi @jasonsturges
I made some changes to code as per your suggestions.
Thank you

In scene.js

animate = () => {
  renderer.setAnimationLoop(function () {
    renderer.render(scene, camera);
    cube.rotation.y += 0.01;
  });
};
//we can create renderer outside the createScene so that the renderer is created only once.

renderer = new WebGLRenderer({ antialias: true });

export const createScene = (el) => {

//we can bind the renderer.domElement (canvas element ) to div
  el.appendChild(renderer.domElement);

  const resize = () => {
    renderer.setSize(el.clientWidth, el.clientHeight);
    camera.aspect = el.clientWidth / el.clientHeight;
    camera.updateProjectionMatrix();
  };

  animate();
  resize();
  window.addEventListener("resize", resize);
};

export const Dispose = () => {
//removes the animationLoop
  renderer.setAnimationLoop();

//we can add code to Dispose objects


};

In App.svelte

<script>
  import { onDestroy, onMount } from "svelte";
  import { createScene, Dispose } from "../scene";

  let el;
  onMount(() => {
    createScene(el);
    return () => {
      Dispose();
    };
  });
</script>

<div class="threeContainer" bind:this={el} />

<style>

  .threeContainer {
    position: absolute;
    width: 100%;
    height: 100%;
  }
</style>