reactjs - 我的 Webpack 配置有什么问题？

Question

我开始在一个学生项目中使用 Webpack，但我坚持配置 Webpack 以包含 React 和 Babel。这是我的节点包：

+-- babel-core@6.18.0
+-- babel-loader@6.2.5
+-- babel-polyfill@6.16.0
+-- babel-preset-es2015@6.18.0
+-- react@15.3.2
+-- react-dom@15.3.2
`-- webpack@1.13.2

...还有我的 webpack 配置文件：

module.exports = {
    entry: ['babel-polyfill', './src/index.jsx'],
    output: {
        path: './build',
        filename: 'app.bundle.js'
    },
    module: {
        loaders: [
            {
                test: /\.jsx?$/,
                exclude: /node_modules/,
                loader: 'babel-loader',
                query: {
                    presets: ['es2015', 'react']
                }
            }
        ]
    }
};

但是webpack命令显示了这个错误：

ERROR in ./src/index.jsx
Module build failed: ReferenceError: [BABEL] C:\wamp\www\tripfighter\src\index.jsx: Unknown option: C:\wamp\www\tripfighter\node_modules\react\react.js.Children. Check out http://babeljs.io/docs/usage/options/ for more information about options.

A common cause of this error is the presence of a configuration options object without the corresponding preset name. Example:

Invalid:
  `{ presets: [{option: value}] }`
Valid:
  `{ presets: ['pluginName', {option: value}] }`

For more detailed information on preset configuration, please see http://babeljs.io/docs/plugins/#pluginpresets-options. (While processing preset: "C:\\wamp\\www\\tripfighter\\node_modules\\react\\react.js")
    at Logger.error (C:\wamp\www\tripfighter\node_modules\babel-core\lib\transformation\file\logger.js:41:11)
    at OptionManager.mergeOptions (C:\wamp\www\tripfighter\node_modules\babel-core\lib\transformation\file\options\option-manager.js:221:20)
    at C:\wamp\www\tripfighter\node_modules\babel-core\lib\transformation\file\options\option-manager.js:260:14
    at C:\wamp\www\tripfighter\node_modules\babel-core\lib\transformation\file\options\option-manager.js:329:22
    at Array.map (native)
    at OptionManager.resolvePresets (C:\wamp\www\tripfighter\node_modules\babel-core\lib\transformation\file\options\option-manager.js:270:20)
    at OptionManager.mergePresets (C:\wamp\www\tripfighter\node_modules\babel-core\lib\transformation\file\options\option-manager.js:259:10)
    at OptionManager.mergeOptions (C:\wamp\www\tripfighter\node_modules\babel-core\lib\transformation\file\options\option-manager.js:244:14)
    at OptionManager.init (C:\wamp\www\tripfighter\node_modules\babel-core\lib\transformation\file\options\option-manager.js:374:12)
    at File.initOptions (C:\wamp\www\tripfighter\node_modules\babel-core\lib\transformation\file\index.js:216:65)
    at new File (C:\wamp\www\tripfighter\node_modules\babel-core\lib\transformation\file\index.js:139:24)
    at Pipeline.transform (C:\wamp\www\tripfighter\node_modules\babel-core\lib\transformation\pipeline.js:46:16)
    at transpile (C:\wamp\www\tripfighter\node_modules\babel-loader\index.js:38:20)
    at Object.module.exports (C:\wamp\www\tripfighter\node_modules\babel-loader\index.js:131:12)
 @ multi main

（有我的示例 index.jsx 文件）

import 'babel-polyfill';
import React from 'react';
import ReactDOM from 'react-dom';

ReactDOM.render(
  <h1>Hello, world!</h1>,
  document.getElementById('root')
);

import cats from './cats.js';
console.log(cats);

所以问题似乎来自我的 webpack.config.js，但我不知道为什么，尽管从网上的许多示例中进行了搜索。你能帮助我吗 ？谢谢 ！

Answer 1

你的配置是

presets: ['es2015', 'react']

但您安装的唯一预设是

+-- babel-preset-es2015@6.18.0

所以你的答案是

npm install --save-dev babel-preset-react

编辑：

仅供参考，Babel 7（当它发布时）对此给出了更清晰的错误消息，因此这将使这些情况的生活更轻松。

Answer 2

您可以通过运行以下命令来消除此错误：

npm install --save-dev babel-preset-react