打包的时候出现很多的js和js.map这是为什么？vue.config.js里的productionSourceMap已经是false

我记得项目一开始打包后最多有一个app.js.map，今天重新npm install项目了一下结果运行打包命令就多了很多1.js 1.js.map, 2.js, 2.js.map ...一共70个。本地运行的时候控制台都没有警告和报错，有大佬知道是什么原因么？vue.config.js里的 productionSourceMap配置一直是false.

vue.config.js, 版本是4.0更新后的那个，时间大概是2个礼拜前:

'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Element Admin' // page title
const port = 9527 // dev port

module.exports = {
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    }
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  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/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    // set preserveWhitespace
    config.module
      .rule('vue')
      .use('vue-loader')
      .loader('vue-loader')
      .tap(options => {
        options.compilerOptions.preserveWhitespace = true
        return options
      })
      .end()

    config
      .when(process.env.NODE_ENV === 'development',
        config => config.devtool('cheap-source-map')
      )

    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')
        }
      )
  }
}

package.json:

{
  "version": "4.0.1",
  "license": "MIT",
  "scripts": {
    "dev": "vue-cli-service serve",
    "build:prod": "vue-cli-service build",
    "build:stage": "vue-cli-service build --mode staging",
    "preview": "node build/index.js --preview",
    "lint": "eslint --ext .js,.vue src",
    "test:unit": "vue-cli-service test:unit",
    "test:ci": "npm run lint && npm run test:unit",
    "svgo": "svgo -f src/icons/svg --config=src/icons/svgo.yml",
    "new": "plop"
  },
  "husky": {
    "hooks": {
      "pre-commit": "lint-staged"
    }
  },
  "lint-staged": {
    "src/**/*.{js,vue}": [
      "eslint --fix",
      "git add"
    ]
  },
  "keywords": [
    "vue",
    "admin",
    "dashboard",
    "element-ui",
    "boilerplate",
    "admin-template",
    "management-system"
  ],
  "repository": {
    "type": "git",
    "url": "git+https://github.com/PanJiaChen/vue-element-admin.git"
  },
  "bugs": {
    "url": "https://github.com/PanJiaChen/vue-element-admin/issues"
  },
  "dependencies": {
    "axios": "0.18.0",
    "browser-md5-file": "^1.0.0",
    "clipboard": "2.0.4",
    "codemirror": "5.45.0",
    "connect": "3.6.6",
    "driver.js": "0.9.5",
    "dropzone": "5.5.1",
    "echarts": "4.2.1",
    "element-ui": "2.7.0",
    "exif-js": "^2.3.0",
    "file-saver": "2.0.1",
    "font-awesome": "4.7.0",
    "fuse.js": "3.4.4",
    "js-cookie": "2.2.0",
    "jsonlint": "1.6.3",
    "jszip": "3.2.1",
    "normalize.css": "7.0.0",
    "nprogress": "0.2.0",
    "screenfull": "4.2.0",
    "showdown": "1.9.0",
    "simplemde": "1.11.2",
    "path-to-regexp": "2.4.0",
    "sortablejs": "1.8.4",
    "spark-md5": "^3.0.0",
    "today-vue-plug-in": "^0.0.6",
    "tui-editor": "1.3.3",
    "vue": "2.6.10",
    "vue-count-to": "1.0.13",
    "vue-cropper": "^0.4.6",
    "vue-i18n": "7.3.2",
    "vue-multiselect": "2.1.0",
    "vue-router": "3.0.2",
    "vue-splitpane": "1.0.4",
    "vuedraggable": "2.20.0",
    "vuex": "3.1.0",
    "xlsx": "0.14.1"
  },
  "devDependencies": {
    "@babel/core": "7.0.0",
    "@babel/register": "7.0.0",
    "@vue/cli-plugin-babel": "3.5.3",
    "@vue/cli-plugin-eslint": "3.5.1",
    "@vue/cli-plugin-unit-jest": "^3.6.3",
    "@vue/cli-service": "3.5.3",
    "@vue/test-utils": "1.0.0-beta.29",
    "babel-core": "7.0.0-bridge.0",
    "babel-eslint": "10.0.1",
    "babel-jest": "^24.7.1",
    "chalk": "2.4.2",
    "chokidar": "2.1.5",
    "connect": "3.6.6",
    "eslint": "5.15.3",
    "eslint-plugin-vue": "5.2.2",
    "html-webpack-plugin": "3.2.0",
    "husky": "1.3.1",
    "lint-staged": "8.1.5",
    "mockjs": "1.0.1-beta3",
    "node-sass": "^4.9.0",
    "plop": "2.3.0",
    "runjs": "^4.3.2",
    "sass-loader": "^7.1.0",
    "script-ext-html-webpack-plugin": "2.1.3",
    "script-loader": "0.7.2",
    "serve-static": "^1.13.2",
    "svg-sprite-loader": "4.1.3",
    "svgo": "1.2.0",
    "vue-template-compiler": "2.6.10"
  },
  "engines": {
    "node": ">= 8.9",
    "npm": ">= 3.0.0"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ]
}

PanJiaChen / vue-element-admin

打包的时候出现很多的js和js.map这是为什么？vue.config.js里的productionSourceMap已经是false #1991