获取错误“错误：无法找到预设”env“相对于目录”

Question

当我运行我的项目Error: Couldn't find preset "env" relative to directory时收到此错误消息npm run dev or npm run build

真的很感激一些帮助，试图解决这两天。

Error Log

ERROR in ./src/main.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Couldn't find preset "env" relative to directory "/Users/marvinbenno/Documents/Code projects/the-ultimate-website"
    at /Users/marvinbenno/Documents/Code projects/the-ultimate-website/the-ultimate-website-sneaekpeak/node_modules/babel-core/lib/transformation/file/options/option-manager.js:293:19
    at Array.map (<anonymous>)
    at OptionManager.resolvePresets (/Users/marvinbenno/Documents/Code projects/the-ultimate-website/the-ultimate-website-sneaekpeak/node_modules/babel-core/lib/transformation/file/options/option-manager.js:275:20)
    at OptionManager.mergePresets (/Users/marvinbenno/Documents/Code projects/the-ultimate-website/the-ultimate-website-sneaekpeak/node_modules/babel-core/lib/transformation/file/options/option-manager.js:264:10)
    at OptionManager.mergeOptions (/Users/marvinbenno/Documents/Code projects/the-ultimate-website/the-ultimate-website-sneaekpeak/node_modules/babel-core/lib/transformation/file/options/option-manager.js:249:14)
    at OptionManager.init (/Users/marvinbenno/Documents/Code projects/the-ultimate-website/the-ultimate-website-sneaekpeak/node_modules/babel-core/lib/transformation/file/options/option-manager.js:368:12)
    at File.initOptions (/Users/marvinbenno/Documents/Code projects/the-ultimate-website/the-ultimate-website-sneaekpeak/node_modules/babel-core/lib/transformation/file/index.js:212:65)
    at new File (/Users/marvinbenno/Documents/Code projects/the-ultimate-website/the-ultimate-website-sneaekpeak/node_modules/babel-core/lib/transformation/file/index.js:135:24)
    at Pipeline.transform (/Users/marvinbenno/Documents/Code projects/the-ultimate-website/the-ultimate-website-sneaekpeak/node_modules/babel-core/lib/transformation/pipeline.js:46:16)
    at transpile (/Users/marvinbenno/Documents/Code projects/the-ultimate-website/the-ultimate-website-sneaekpeak/node_modules/babel-loader/lib/index.js:50:20)
 @ multi (webpack)-dev-server/client?http://localhost:8080 (webpack)/hot/dev-server.js ./src/main.js main[2]"

./webpack.config.js

var path = require('path')
var webpack = require('webpack')

module.exports = {
  entry: './src/main.js',
  output: {
    path: path.resolve(__dirname, './dist'),
    publicPath: '/dist/',
    filename: 'build.js'
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          'vue-style-loader',
          'css-loader'
        ],
      },      {
        test: /\.vue$/,
        loader: 'vue-loader',
        options: {
          loaders: {
          }
          // other vue-loader options go here
        }
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/
      },
      {
        test: /\.(png|jpg|gif|svg)$/,
        loader: 'file-loader',
        options: {
          name: '[name].[ext]?[hash]'
        }
      }
    ]
  },
  resolve: {
    alias: {
      'vue$': 'vue/dist/vue.esm.js'
    },
    extensions: ['*', '.js', '.vue', '.json']
  },
  devServer: {
    historyApiFallback: true,
    noInfo: true,
    overlay: true
  },
  performance: {
    hints: false
  },
  devtool: '#eval-source-map'
}

if (process.env.NODE_ENV === 'production') {
  module.exports.devtool = '#source-map'
  // http://vue-loader.vuejs.org/en/workflow/production.html
  module.exports.plugins = (module.exports.plugins || []).concat([
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"production"'
      }
    }),
    new webpack.optimize.UglifyJsPlugin({
      sourceMap: true,
      compress: {
        warnings: false
      }
    }),
    new webpack.LoaderOptionsPlugin({
      minimize: true
    })
  ])
}

./package.json

{
  "name": "the-ultimate-website",
  "description": "A Vue.js project",
  "version": "1.0.0",
  "author": "Marvin <[email protected]>",
  "license": "MIT",
  "private": true,
  "scripts": {
    "dev": "cross-env NODE_ENV=development webpack-dev-server --open --hot",
    "build": "cross-env NODE_ENV=production webpack --progress --hide-modules"
  },
  "dependencies": {
    "@babel/polyfill": "^7.2.5",
    "babel": "^6.23.0",
    "babel-core": "^6.26.3",
    "babel-loader": "^7.1.5",
    "babel-preset-env": "^1.7.0",
    "babel-preset-stage-3": "^6.24.1",
    "bootstrap-vue": "^2.0.0-rc.14",
    "joi": "^14.3.1",
    "jshint-loader": "^0.8.4",
    "vee-validate": "^2.2.0",
    "vue": "^2.5.11",
    "vue-resource": "^1.5.1",
    "vue-router": "^3.0.2"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ],
  "devDependencies": {
    "cross-env": "^5.0.5",
    "css-loader": "^2.1.1",
    "file-loader": "^3.0.1",
    "vue-loader": "^15.7.0",
    "vue-template-compiler": "^2.4.4",
    "webpack": "^4.29.6",
    "webpack-cli": "^3.3.0",
    "webpack-dev-server": "^3.2.1"
  }
}

Project Code

https://github.com/Marre1020/the-ultimate-website-sneakpeak

Answer 1

首先，你不应该将qazxsw poi目录检入git仓库。确保正确使用qazxsw poi。

您在构建期间发生了所有错误

Try below steps to fix the error occuring during build time

• 从您的git仓库下载您的项目并将其放入一个新文件夹
• 删除node_modules/目录
• 使用.gitignore安装所有模块
• 在你的node_modules中，你已经包含了npm install脚本来启动你的项目。不要全局安装它。您必须在项目本地安装此库。当您将项目部署到任何服务器时，您需要使用此package.json来启动项目。安装cross-env包作为prod依赖项。 cross-env
• 你在cross-env中加入了npm install --save cross-env。但是你没有安装这个装载机。安装vue-style-loader以允许webpack解析webpack.config.js文件中编码的样式vue-style-loader
• 您目前使用的.vue npm install --save-dev vue-style-loader需要在vue-loader中配置插件。在"vue-loader": "^15.7.0"之后加入webpack.config.js，如下所示。

VueLoaderPlugin

• 在开发模式devtool configuration中运行项目以在浏览器中查看输出。首选浏览器浏览器。我忽略了您的代码在节点控制台中生成的警告消息，您必须对其进行处理。

Uglify plugin causes few problems while building the project for production

./webpack.config.js

...
const { VueLoaderPlugin } = require('vue-loader')

module.exports = {
   ...
  devtool: '#eval-source-map',
  plugins : [
    new VueLoaderPlugin()
  ]
}

我建议你从你的npm run dev中删除uglifyjs相关的配置，并在生产模式下测试你的代码。您可以继续研究如何使用uglifyjs插件修复问题或发布新问题。

Webpack configuration without uglifyjs plugin

npm run build