如何从下一个js的节点模块外部的文件夹中导入模块

我一直在努力从three.js导入示例模块，在我的项目中使用了next.js（服务器端React框架）以及快速自定义服务器。我的服务器代码看起来像这样-

const express = require('express');
const next = require('next');

const favicon = require('serve-favicon');
var path = require('path');
let fs = require('fs')

const dev = process.env.NODE_ENV !== 'production';
const nextApp = next({ dev });

nextApp.prepare()
    .then(() => {

        let server = express(), options = {}, PORT = 3000, app = express()

        if (dev) {
            // DEVELOPMENT ///

            // DEVELOPMENT ///  
        }
        else {
            // PRODUCTION ///

            options = {
                ...options
            }
            // PRODUCTION ///
        }

        server.use(favicon(path.join(__dirname, "/favicon.ico")))


        server.get('/', (req, res) => {
            const actualPage = '/';
            nextApp.render(req, res, actualPage);
        });

        server.get('*', (req, res) => {
            const actualPage = '/not-found';

            nextApp.render(req, res, actualPage);
            // return handle(req, res)
        });


        server.listen((PORT), (err) => {
            if (err) throw err
            console.log('>> Ready on ' + PORT)
        })

    })

    .catch((ex) => {
        console.error(ex.stack)
        process.exit(1)
    })

我基本上运行了一个npx create-next-app并在next.js项目中配置了一个自定义快递服务器以进行动态路由，如您在上面的代码中看到的那样。

然后，我使用three.js在home组件中创建了一个场景，该场景被导入并渲染到App.js文件中。我的home.js组件看起来像这样-

import React, { useState, useEffect } from 'react'
import * as THREE from 'three'
import { TrackballControls } from 'three/examples/jsm/controls/TrackballControls'

import "../src/assets/sass/home.scss"

const X = () => {

let parent, renderer, scene, camera, TrackballControls

useEffect(() => {

    // 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, 1, 100 )
    camera.position.set( 20, 20, 20 )

    // controls
    controls = new TrackballControls( camera )
    controls.minDistance = 5
    controls.maxDistance = 250
    controls.enableDamping = true; // an animation loop is required when either damping or auto-rotation are enabled
    controls.dampingFactor = 0.05;

    // axes
    // scene.add(new THREE.AxisHelper( 20 ))

    // geometry
    let geometry = new THREE.SphereGeometry( 2, 8, 6, 0, 6.3, 0, 3.1)

    // material
    let material = new THREE.MeshBasicMaterial({
        wireframe: true,
        wireframeLinewidth: 1
    })

    let sphere = new THREE.Mesh( geometry, material )

    // parent
    parent = new THREE.Object3D()
    scene.add( parent )
    scene.add( sphere )

    function animate() {
        requestAnimationFrame( animate )
        parent.rotation.z += 0.01
        controls.update()
        renderer.render( scene, camera )
    }

    animate()
}

,[])

return <div></div>
}

export default X

现在这是我面临的问题-我正在从three.js导入一个名为TrackballControls的示例模块，该模块不完全位于核心三个模块内部，而是位于其外部的文件夹中，您可以从路径中看到它-'three / examples /jsm/controls/TrackballControls.js'。您可以在此处看到更多信息-分别导入es6模块。但是不知何故，它不起作用。它抛出像

我尝试使用一个简单的create-react-app做同样的事情，导入完全有效！因此，我知道服务器端代码存在问题，并且我假设这是与Webpack相关的问题。但是我对webpack真的不了解。有人请帮助我，将不胜感激！

如果有帮助，这是我的next.config.js文件-

const withSASS = require('@zeit/next-sass')

const { parsed: localEnv } = require('dotenv').config()
const webpack = require('webpack')
// const path = require('path')

function HACK_removeMinimizeOptionFromCssLoaders(config) {
  console.warn(
    'HACK: Removing `minimize` option from `css-loader` entries in Webpack config',
  )
  config.module.rules.forEach(rule => {
      if (Array.isArray(rule.use)) {
          rule.use.forEach(u => {
      if (u.loader === 'css-loader' && u.options) {
          delete u.options.minimize
    }
  })
}
})
}

module.exports = withSASS(
  {
      webpack(config) {
        HACK_removeMinimizeOptionFromCssLoaders(config)
        config.plugins.push(new webpack.EnvironmentPlugin(localEnv))

        return config
  }
  })