three.js dev template - module

HTML

<button id="export">
Export
</button>

CSS

body {
	margin: 0px;
}
button {
	position: absolute;
}
canvas {
	display: block;
}

JavaScript

import * as THREE from "https://threejs.org/build/three.module.js";
import { OrbitControls } from "https://threejs.org/examples/jsm/controls/OrbitControls.js";
import { GLTFExporter } from "https://threejs.org/examples/jsm/exporters/GLTFExporter.js";

var mesh, renderer, scene, camera, controls;

init();
animate();

async function init() {

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

    // scene
    scene = new THREE.Scene();
    
    // camera
    camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 0.1, 100 );
    camera.position.set( 0, 0, 5 );

    // controls
    controls = new OrbitControls( camera, renderer.domElement );

    // geometry
    var geometry = new THREE.BoxBufferGeometry();
		
    // material
		
		var loader = new THREE.TextureLoader();
		var [ t1, t2, t3, t4, t5, t6 ] = await Promise.all( [
			loader.loadAsync( 'https://threejs.org/examples/textures/brick_diffuse.jpg' ),
			loader.loadAsync( 'https://threejs.org/examples/textures/colors.png' ),
			loader.loadAsync( 'https://threejs.org/examples/textures/crate.gif' ),
			loader.loadAsync( 'https://threejs.org/examples/textures/disturb.jpg' ),
			loader.loadAsync( 'https://threejs.org/examples/textures/water.jpg' ),
			loader.loadAsync( 'https://threejs.org/examples/textures/uv_grid_opengl.jpg' )
		] );
		
    var material = [
			new THREE.MeshBasicMaterial( { map: t1 } ),
			new THREE.MeshBasicMaterial( { map: t2 } ),
			new THREE.MeshBasicMaterial( { map: t3 } ),
			new THREE.MeshBasicMaterial( { map: t4 } ),
			new THREE.MeshBasicMaterial( { map: t5 } ),
			new THREE.MeshBasicMaterial( { map: t6 } ),
		];
    
    // mesh
    mesh = new THREE.Mesh( geometry, material );
    scene.add( mesh );
		
		var button = document.getElementById( 'export' );
		button.addEventListener( 'click', function() {
		
			var exporter = new...