Webpack + Babel:无法找到相对于目录的预设"es2015"

Question

我有一个使用Webpack和Babel的React项目.当我在办公室计算机上创建它时,Webpack运行正常.当我将项目克隆到我的个人计算机上时,它出现以下错误:

ERROR in ./react_minesweeper.jsx
Module build failed: Error: Couldn't find preset "es2015" relative to directory "/Users/louisstephancruz/Desktop"
at /Users/louisstephancruz/Desktop/w6d5/minesweeper/node_modules/babel-core/lib/transformation/file/options/option-manager.js:298:19
at Array.map (native)
at OptionManager.resolvePresets (/Users/louisstephancruz/Desktop/w6d5/minesweeper/node_modules/babel-core/lib/transformation/file/options/option-manager.js:269:20)

这是我的webpack.config.js:

module.exports = {
  entry: './react_minesweeper.jsx',
  output: {
    path: './',
    filename: 'bundle.js',
  },
  module: {
    loaders: [
      {
        test: [/\.jsx?$/, /\.js?$/],
        exclude: /(node_modules)/,
        loader: 'babel',
        query: {
          presets: ['es2015', 'react']
        }
      }
    ]
  },
  devtool: 'source-map',
  resolve: {
    extensions: ['', '.js', '.jsx' ]
  }
};

这是我的package.json:

{
  "name": "minesweeper",
  "version": "1.0.0",
  "description": "",
  "main": "webpack.config.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "webpack-dev-server --inline"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "babel": "^6.5.2",
    "babel-core": "^6.17.0",
    "babel-loader": "^6.2.5",
    "babel-preset-es2015": "^6.16.0",
    "babel-preset-react": "^6.16.0",
    "webpack": "^1.13.2",
    "webpack-dev-server": "^1.16.2"
  },
  "dependencies": {
    "react": "^15.3.2",
    "react-dom": "^15.3.2"
  }
}

我的节点版本是:v5.6.0我的npm版本是:3.6.0

Answer 1

npm i 要么 npm install

应该在package.json依赖项和dev依赖项中安装所有软件包(只要你的NODE_ENV环境变量不相等production).

要检查您是否安装了特定的软件包,您可以:

npm ls babel-preset-es2015

如果由于某种原因,你的NODE_ENV是production,你想安装就可以使用开发的依赖关系:

npm install --only=dev

相反,以下内容可用于处理已构建代码且不需要访问任何开发依赖项的生产机器:

npm install --only=prod

我建议.babelrc使用以下内容在repo的根目录中创建一个:

{ "presets": [ "es2015", "react" ] }

对于webpack配置,您可能需要指定其他一些选项:

{ context: __dirname
, resolve: { root: __dirname, extensions: [ '.js', '.jsx', '.json' ] }
}

除了你的配置的其余部分,这告诉webpack应该从哪里发生捆绑的根目录以及将哪些文件扩展名视为模块(你可以在require/ importstatements中省略哪些扩展名).

我建议你检查出的WebPack的resolve.extensions关于该位的更多信息.

Answer 2

npm install babel-preset-es2015

这有帮助吗？

Answer 3

当我从"/ Users/username"目录中删除.babelrc(隐藏)文件时,我解决了这个问题.