You might notice after requiring React JS into your project that the time it takes from a save to a finished rebundle of your application takes more time. In development you ideally want from 200-800 ms rebundle speed, depending on what part of the application you are working on.

你可能注意到在引入 React JS 到你的项目之后，给你的应用重新合并会花费太多的时间。在开发环境中，最理想的是编译最多 200 到 800 毫秒的速度，取决于你在开发的应用。

IMPORTANT! This setup a minified, production version of React. As a result you will lose propTypes based type validation!

注意！这个是设置一个压缩和发布的 React 版本，结果你可能会失去 propTypes 基础类型检查！

在开发环境中使用压缩文件

Instead of making Webpack go through React JS and all its dependencies, you can override the behavior in development.

为了不让 Webpack 去遍历 React JS 及其所有依赖，你可以在开发中重写它的行为。

webpack.config.js

var path = require('path');
var node_modules = path.resolve(__dirname, 'node_modules');
var pathToReact = path.resolve(node_modules, 'react/dist/react.min.js');

config = {
    entry: ['webpack/hot/dev-server', path.resolve(__dirname, 'app/main.js')],
    resolve: {
        alias: {
          'react': pathToReact
        }
    },
    output: {
        path: path.resolve(__dirname, 'build'),
        filename: 'bundle.js',
    },
    module: {
        loaders: [{
            test: /\.jsx?$/,
            loader: 'babel'
        }],
        noParse: [pathToReact]
    }
};

module.exports = config;

We do two things in this configuration:

我们在配置中做了两件事：

1. Whenever "react" is required in the code it will fetch the minified React JS file instead of going to node_modules

2. Whenever Webpack tries to parse the minified file, we stop it, as it is not necessary

1. 每当 "react" 在代码中被引入，它会使用压缩后的 React JS 文件，而不是到 node_modules 中找。
2. 每当 Webpack 尝试去解析那个压缩后的文件，我们阻止它，因为这不必要。

Take a look at Optimizing development for more information on this.

可以到 优化开发 看到更多这方面的信息。