webpack - 错误: Can't resolve 'babel-loader'

Question

我收到这个错误，你能帮帮我吗。以下是我的 webpack.config 和 package.JSON 文件。我的服务器工作正常，但 webpack 不行。我全局安装了 Webpack，但这并没有解决这个问题。

===webpack.config文件===

var path = require('path');
const webpack = require('webpack');
module.exports = {
  entry: './src/app.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'public')
  },
watch: true,
module: {
  loaders: [
    {
      test:/\.js$/,
      exclude:/node_modules/,
      loader: 'babel-loader',
      query: {
        presets: ['react', 'es2015', 'stage-1']
      }
    }

  ]
}

===Package.JSON 文件===

{
  "name": "reduxApp",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "webpack": "^3.5.5"
  },
  "dependencies": {
    "babel": "^6.23.0",
    "babel-core": "^6.26.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-react": "^6.23.0",
    "babel-preset-stage-1": "^6.24.1",
    "express": "^4.15.4",
    "loader": "^2.1.1",
    "redux": "^3.7.2"
  }
}

Answer 1

此包允许使用 Babel 和 webpack 转译 JavaScript 文件。

此任务所需的只是添加实际的加载程序和环境预设作为开发依赖项:npm install -D babel-loader babel-preset-env

在你的 webpack 配置对象中，你需要将 babel-loader 添加到模块列表中，如下所示:

模块:{
规则:[
{
测试:/\.js$/,
排除:/(node_modules|bower_components)/,
使用: {
加载器:'巴别塔加载器'，
选项: {
预设:['env']
}
}
}
]
}