webpack - 错误：无法解析“babel-loader”

Question

我收到此错误，请您帮帮我。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。我在全球范围内安装了 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

这个包允许使用 Babel 和 webpack 转译 JavaScript 文件。

此任务所需要做的就是添加实际的加载器和环境预设作为开发依赖项： npm install -D babel-loader babel-preset-env

在您的 webpack 配置对象中，您需要将 babel-loader 添加到模块列表中，如下所示：

module: { rules: [ { test: /\.js$/, exclude: /(node_modules|bower_components)/, use: { loader: 'babel-loader', options: { presets: ['env'] } } } ] }