vue.config.js 

'use strict'
const path = require('path')

function resolve(dir) {
  return path.join(__dirname, dir)
}
const CompressionPlugin = require('compression-webpack-plugin');
const CopyWebpackPlugin = require("copy-webpack-plugin");
const webpack = require("webpack");

let cesiumSource = "node_modules/cesium/Source";
const cesiumWorkers = '../Build/Cesium/Workers'

const name = process.env.VUE_APP_TITLE || 'RuoYi-Flowable-Plus后台管理系统' // 网页标题

const port = process.env.port || process.env.npm_config_port || 80 // 端口

// vue.config.js 配置说明
//官方vue.config.js 参考文档 https://cli.vuejs.org/zh/config/#css-loaderoptions
// 这里只列一部分，具体配置参考文档
module.exports = {
  // 部署生产环境和开发环境下的URL。
  // 默认情况下，Vue CLI 会假设你的应用是被部署在一个域名的根路径上
  // 例如 https://www.ruoyi.vip/。如果应用被部署在一个子路径上，你就需要用这个选项指定这个子路径。例如，如果你的应用被部署在 https://www.ruoyi.vip/admin/，则设置 baseUrl 为 /admin/。
  publicPath: process.env.VUE_APP_CONTEXT_PATH,
  // 在npm run build 或 yarn build 时 ，生成文件的目录名称（要和baseUrl的生产环境路径一致）（默认dist）
  outputDir: 'dist',
  // 用于放置生成的静态资源 (js、css、img、fonts) 的；（项目打包之后，静态资源会放在这个文件夹下）
  assetsDir: 'static',
  // 是否开启eslint保存检测，有效值：ture | false | 'error'
  lintOnSave: process.env.NODE_ENV === 'development',
  // 如果你不需要生产环境的 source map，可以将其设置为 false 以加速生产环境构建。
  productionSourceMap: false,
  // webpack-dev-server 相关配置
  devServer: {
    host: '0.0.0.0',
    port: port,
    open: false,
    proxy: {
      // detail: https://cli.vuejs.org/config/#devserver-proxy
      [process.env.VUE_APP_BASE_API]: {
        target: `http://localhost:8080`,
        changeOrigin: true,
        pathRewrite: {
          ['^' + process.env.VUE_APP_BASE_API]: ''
        }
      }
    },
    disableHostCheck: true
  },
  css: {
    loaderOptions: {
      sass: {
        sassOptions: { outputStyle: "expanded" }
      }
    }
  },
  configureWebpack: {
    name: name,
    resolve: {
      alias: {
        '@': resolve('src'),
        'cesium':  path.resolve(__dirname, cesiumSource),
      },
  // 参考别人说的，我不太懂webpack，所以都不知道咋解决https zlib问题  必写-2
    //  fallback: { "https": false, "zlib": false, "http": false, "url": false },
    },

    plugins: [
        // 标识cesium资源所在的主目录，cesium内部资源加载、多线程等处理时需要用到
        new webpack.DefinePlugin({
          //不要有"."
          CESIUM_BASE_URL: JSON.stringify("/")
   }),
   new CopyWebpackPlugin([
          {from: path.join(cesiumSource, cesiumWorkers), to: "Workers"},
          {from: path.join(cesiumSource, "Assets"), to: "Assets"},
          {from: path.join(cesiumSource, "Widgets"), to: "Widgets"},
          {from: path.join(cesiumSource, "ThirdParty/Workers"), to: "ThirdParty/Workers"}
  ]),
      // http://doc.ruoyi.vip/ruoyi-vue/other/faq.html#使用gzip解压缩静态文件
      new CompressionPlugin({
        cache: false,                   // 不启用文件缓存
        test: /\.(js|css|html)?$/i,     // 压缩文件格式
        filename: '[path].gz[query]',   // 压缩后的文件名
        algorithm: 'gzip',              // 使用gzip压缩
        minRatio: 0.8                   // 压缩率小于1才会压缩
      })
    ],
  },
  chainWebpack(config) {
    config.plugins.delete('preload') // TODO: need test
    config.plugins.delete('prefetch') // TODO: need test

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/assets/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/assets/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
            // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial' // only package third parties that are initially dependent
                },
                elementUI: {
                  name: 'chunk-elementUI', // split elementUI into a single package
                  priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                },
                commons: {
                  name: 'chunk-commons',
                  test: resolve('src/components'), // can customize your rules
                  minChunks: 3, //  minimum common number
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          config.optimization.runtimeChunk('single'),
          {
             from: path.resolve(__dirname, './public/robots.txt'), //防爬虫文件
             to: './' //到根目录下
          }
        }
      )
  }
}

// const { defineConfig } = require('@vue/cli-service')
// module.exports = defineConfig({
//   transpileDependencies: true
// })

const { defineConfig } = require('@vue/cli-service')
 
const CopyWebpackPlugin = require('copy-webpack-plugin')
const webpack = require('webpack')
const path = require('path')
 
let cesiumSource = './node_modules/cesium/Source/' //按理说应该是未打包的
// 此处必需，因为高版本cesium没有这个Workers报错。必写-1
const cesiumWorkers = '../Build/Cesium/Workers'
 
module.exports = defineConfig({
  transpileDependencies: true,
  publicPath: './',
  outputDir: "dist", // 输出文件目录
  lintOnSave: false, // eslint 是否在保存时检查 关闭语法检查
  // assetsDir: 'static', // 配置js、css静态资源二级目录的位置
  
  configureWebpack: {
    module: {
      rules: [
        {
          test: /\.(gltf)$/,
          loader: 'url-loader'
        },
        {
          test: /\.(glb)$/,
          loader: 'url-loader'
        },
          {
          test: /\.js$/,
          use: {
          loader: '@open-wc/webpack-import-meta-loader',
          },
          },
          {
            test: /\.(js)$/,
            loader: 'babel-loader'
          },
          {
            test: /\.(png|jpg|gif|webp|svg)$/,
            type:'asset/resource'
          },
          {
            test: /\.ts$/,
               loader: 'ts-loader',
               options: { appendTsSuffixTo: [/\.vue$/] }
           }
      ],
    },
    output: {
      sourcePrefix: ' '
    },
    amd: {
      toUrlUndefined: true
    },
    resolve: {
      alias: {
        '@': path.resolve('src'),
        'cesium': path.resolve(__dirname, cesiumSource)
      },
      // 参考别人说的，我不太懂webpack，所以都不知道咋解决https zlib问题  必写-2
      fallback: { "https": false, "zlib": false, "http": false, "url": false },
    },
    plugins: [
      // 对于webpack版本此处有不同配置，webpack低版本5.x执行下面4行注释的代码，对于webpack高版本9.x及以上，patterns是可以的。
      new CopyWebpackPlugin({
        patterns: [
          { from: path.join(cesiumSource, cesiumWorkers), to: 'Workers' },
          { from: path.join(cesiumSource, 'Assets'), to: 'Assets' },
          { from: path.join(cesiumSource, 'Widgets'), to: 'Widgets' },
          { from: path.join(cesiumSource, 'ThirdParty/Workers'), to: 'ThirdParty/Workers' },
        ],
      }),
      // new CopyWebpackPlugin([ { from: path.join(cesiumSource, 'Workers'), to: 'Workers'}]),
      // new CopyWebpackPlugin([ { from: path.join(cesiumSource, 'Assets'), to: 'Assets'}]),
      // new CopyWebpackPlugin([ { from: path.join(cesiumSource, 'Widgets'), to: 'Widgets'}]),
      // new CopyWebpackPlugin([ { from: path.join(cesiumSource, 'ThirdParty/Workers'), to: 'ThirdParty/Workers'}]),
      new webpack.DefinePlugin({
        CESIUM_BASE_URL: JSON.stringify('./')
        // CopyWebpackPlugin from的绝对路径
      })
    ],

  },
})

 Uncaught SyntaxError: Unexpected token '<':不要加点，要不cesium地球无法正常加载，黑的   

 CESIUM_BASE_URL: JSON.stringify('/')