webpack-dev-server
webpack-dev-server是一个小型的Node.js Express服务器,它使用webpack-dev-middleware来服务于webpack的包,除此自外，它还有一个通过来连接到服务器的微型运行时.
我们来看一下下面的配置文件(webpack.config.js)
这里你将你的源文件放在app文件夹下,并通过webpack将其打包到build文件夹下的bundle.js中.
注意:webpack-dev-server是一个独立的NPM包,你可以通过npm install webpack-dev-server来安装它.
基本目录
webpack-dev-server默认会以当前目录为基本目录,除非你制定它.
上述命令是在命令行中执行的,它将build目录作为根目录.有一点需要注意的是:webpack-dev-server生成的包并没有放在你的真实目录中,而是放在了内存中.
我们在基本目录下新建一个index.html文件,然后在浏览器中输入http://localhost:8080访问.
var compiler = webpack(config);
var server = new WebpackDevServer(compiler,{
contentBase:'build/',publicPath: "/assets/"
});
server.listen(8080);
在Node中运行上面的代码即可。
注意：webpack配置中的devSever配置项只对在命令行模式有效。
(Hot Module Replacement)热模块替换
在命令行中运行inline模式，并启用热模块替换
这里只需要多增加 --hot指令就OK了.如下所示.
注意:命令行模式下,webpack.config.js中一定要配置output.publicPath来指定编译后的包(bundle)的访问位置.
在Nodejs API中运行inline模式，并启用热模块替换
这里需要做以下三点:
- 在webpack.config.js的entry选项中添加:webpack/hot/dev-server
- 在webpack.config.js的plugins选项中添加:new webpack.HotModuleReplacementPlugin()
- 在webpack-dev-server的配置中添加：hot:true
webpack-dev-server中的配置选项
// configuration
});
var server = new WebpackDevServer(compiler,{
// webpack-dev-server options
contentBase: "/path/to/directory",// Can also be an array,or: contentBase: "http://localhost/",hot: true,// Enable special support for Hot Module Replacement
// Page is no longer updated,but a "webpackHotUpdate" message is send to the content
// Use "webpack/hot/dev-server" as additional module in your entry point
// Note: this does not add the HotModuleReplacementPlugin like the CLI option does.
// Set this as true if you want to access dev server from arbitrary url.
// This is handy if you are using a html5 router.
historyApiFallback: false,// Set this if you want to enable gzip compression for assets
compress: true,// Set this if you want webpack-dev-server to delegate a single path to an arbitrary server.
// Use "" to proxy all paths to the specified server.
// This is useful if you want to get rid of 'http://localhost:8080/' in script[src],// and has many other use cases (see https://github.com/webpack/webpack-dev-server/pull/127 ).
proxy: {
"": "http://localhost:9090"
},setup: function(app) {
// Here you can access the Express app object and add your own custom middleware to it.
// For example,to define custom handlers for some paths:
// app.get('/some/path',function(req,res) {
// res.json({ custom: 'response' });
// });
},// pass static options to inner express server
staticOptions: {
},// webpack-dev-middleware options
quiet: false,noInfo: false,lazy: true,filename: "bundle.js",watchOptions: {
aggregateTimeout: 300,poll: 1000
},// It's a required option.
publicPath: "/assets/",headers: { "X-Custom-Header": "yes" },stats: { colors: true }
});
server.listen(8080,"localhost",function() {});
// server.close();
