Question

对于使用babel loader和eslint的webpack，我有点新鲜我正在尝试编译一个非常基本的应用程序我得到这个奇怪的语法错误，我无法弄清楚

这是我的index.js，我得到编译错误

const store = configureStore()

render(
  <Router>
    <Root store={ store } />
  </Router>,
  document.getElementById('console_root')
)

这是我得到的错误：

ERROR in ./src/index.js
Module build failed: SyntaxError: Unexpected token (19:2)

  17 |
  18 | render(
> 19 |   <Router>
     |   ^
  20 |     <Root store={ store } />
  21 |   </Router>,
  22 |   document.getElementById('console_root')

npm ERR! code ELIFECYCLE
npm ERR! errno 2

这是我的webpack.config.js文件

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

module.exports = {
  entry: {
    main: path.resolve(__dirname, 'src', 'index.js')
  },
  resolve: {
    extensions: ['*', '.js', '.jsx']
  },
  output: {
    path: path.resolve(__dirname, '..'),
    publicPath: '/',
    filename: 'bundle.js'
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader', 'eslint-loader']
      },
      {
        test: /\.scss$/,
        use: ['style-loader', 'css-loader', 'sass-loader']
      }
    ]
  },
  plugins: [
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false
      }
    }),
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"production"'
      }
    })
  ]
}

这些是我的依赖项：

    "dependencies": {
    "material-ui": "^1.0.0-beta.26",
    "material-ui-icons": "^1.0.0-beta.17",
    "prop-types": "^15.6.0",
    "react": "^16.2.0",
    "react-dom": "^16.2.0",
    "react-redux": "^5.0.6",
    "react-router-dom": "^4.2.2",
    "redux": "^3.7.2"
  },
  "devDependencies": {
    "babel-core": "^6.26.0",
    "babel-eslint": "^8.1.2",
    "babel-loader": "^7.1.2",
    "css-loader": "^0.28.7",
    "eslint": "^4.14.0",
    "eslint-loader": "^1.9.0",
    "eslint-plugin-react": "^7.5.1",
    "react-scripts": "^1.0.17",
    "sass-loader": "^6.0.6",
    "style-loader": "^0.19.1",
    "webpack": "^3.10.0"
  }

任何想法我做错了什么？

Answer 1

好像您错过了将react预设添加到 webpack.config.js 文件或 .babelrc 。

首先应安装它：npm i babel-preset-react --save-dev 然后将react预设添加到您的webpack配置中，如下所示

  module: {
  rules: [
    {
      test: /\.js$/,
      exclude: /node_modules/,
      use: {
        loader: 'babel-loader',
        options: {
          presets: ['react']
        }
      }
    }
  ]
}

或者创建一个名为 .babelrc 的新文件并将其添加到那里

// .babelrc
{
  "presets": ["react"]
}

它应该适合你。

Answer 2

我想您需要创建一个包含内容的.babelrc文件

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

这将告诉babel将es6转换为es5并且还告诉我们有一个反应项目并且它将相应地处理。对于这些，你需要两个包来完成这项工作

npm install babel-preset-es2015 --save
npm install babel-preset-react --save

Check this blog for more info

编译反应与webpack语法错误

2 个答案: