three.js dev template - module

HTML

<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
    
<script type="importmap">
	{
		"imports": {
			"three": "https://raw.githack.com/mrdoob/three.js/dev/build/three.module.js",
      "three/addons/": "https://raw.githack.com/mrdoob/three.js/dev/examples/jsm/"
		}
	}
</script>

CSS

body {
	margin: 0px;
}

JavaScript

// Simple three.js example

import * as THREE from 'three';
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';

let mesh, renderer, scene, camera, controls;

const findZClippingPlanes = (scene, camera) => {
	let near = Infinity, far = -Infinity;
	const vertex = new THREE.Vector3();

	camera.updateMatrixWorld();
	const camPos = camera.position;

	const frustum = new THREE.Frustum();
	frustum.setFromProjectionMatrix(camera.projectionMatrix);

	scene.traverseVisible(obj => {
		if(!obj.isMesh) return;

		obj.updateMatrixWorld();
		if(!frustum.intersectsObject(obj)) return;

		const geom = obj.geometry.clone();
		geom.applyMatrix4(obj.matrixWorld);
		const pos = geom.getAttribute('position');
		for(let i = 0; i < pos.count; ++i) {
			vertex.set(pos.getX(i), pos.getY(i), pos.getZ(i));
			const dist = camPos.distanceToSquared(vertex);
			near = Math.min(near, dist);
			far = Math.max(far, dist);
		}
		geom.dispose();

	})

	near = Math.sqrt(near) - .1;
	far = Math.sqrt(far) + .1;
	return [near, far];
}

init();
animate();

function init() {

    // renderer
    renderer = new THREE.WebGLRenderer();
    renderer.setSize( window.innerWidth, window.innerHeight );
    renderer.setPixelRatio( window.devicePixelRatio );
    document.body.appendChild( renderer.domElement );

    // scene
    scene = new THREE.Scene();
    
    // camera
    camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 10000 );
    camera.position.set( 20, 20, 20 );

    // controls
    controls = new OrbitControls( camera, renderer.domElement );
    
    // ambient
    scene.add( new THREE.AmbientLight( 0x222222 ) );
    
    // light
    const light = new THREE.DirectionalLight( 0xffffff, 1 );
    light.position.set( 20,20, 0 );
    scene.add( light );
    
    // axes
    scene.add( new THREE.AxesHelper( 20 ) );

    // geometry
    const geometry = new THREE.SphereGeometry( 10, 12, 8 );
    
    // material
    const material = new...