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://unpkg.com/three@0.145/build/three.module.js"
		}
	}
</script>

CSS

body {
	margin: 0px;
}

JavaScript

import * as THREE from 'three';
import { OrbitControls } from "https://unpkg.com/three@0.145/examples/jsm/controls/OrbitControls.js";
import { DecalGeometry } from "https://unpkg.com/three@0.145/examples/jsm/geometries/DecalGeometry.js";

var mesh, renderer, scene, camera, controls;
var mouse, raycaster, helper, decalMaterial;

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
    var light = new THREE.DirectionalLight( 0xffffff, 1 );
    light.position.set( 20,20, 0 );
    scene.add( light );
    
    // axes
    scene.add( new THREE.AxesHelper( 20 ) );

    // geometry
    var geometry = new THREE.SphereGeometry( 5, 12, 8 );
    
    // material
    var material = new THREE.MeshPhongMaterial( {
        color: 0x00ffff, 
        flatShading: true
    } );
    
    // mesh
    mesh = new THREE.Mesh( geometry, material );
    scene.add( mesh );
		
		// decal related stuff 
		
		mouse = new THREE.Vector2();
		raycaster = new THREE.Raycaster();
		helper = new THREE.Object3D();

		decalMaterial = new THREE.MeshBasicMaterial( { color: 0xffffff, depthWrite: false, polygonOffset: true, polygonOffsetFactor: - 4, } );
		
		document.addEventListener( 'click', onClick );
		
}

function onClick( event ) {

		event.preventDefault();

		mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
		mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
		
		raycaster.setFromCamera( mouse,...