Question

我尝试将webpack用于使用socket.io的节点服务器。

我有一个简单的服务器：

var server = require('http').createServer();
var io = require('socket.io').listen(server);

io.on('connection', function(client) {
  console.log('new client');

  client.on('hello', function(data) {
    console.log('msg: ', data);
  });

  client.on('disconnect', function(){
    console.log('client disconnect');
  });
});

server.listen(3000);

我的webpack.config.js

var config = {
  target: "node",
  entry: {
    server: ["server.js"]
  },
  module: {
    loaders: [
      {
        test: /\.(txt|json|osgjs|osgt|bin)$/,
        loader: "file?name=[path][name].[ext]"
      }
    ],
    noParse: ["ws"]
  }
  externals: ["ws"],
  output: {
    path: __dirname,
    filename: "[name].js"
  }
}

module.exports = config;

当我“编译”时，我没有错误，只是一个警告：

> NODE_ENV=development BUILD_TARGET=server webpack --display-error-details

Hash: a692e23215bcd6caa05a
Version: webpack 1.13.2
Time: 672ms
                                       Asset     Size  Chunks             Chunk Names
              _/node_modules/mime-db/db.json   145 kB          [emitted]  
_/node_modules/socket.io-client/package.json  4.29 kB          [emitted]  
                                   server.js   572 kB       0  [emitted]  server
   [0] multi server 28 bytes {0} [built]
   [1] ./server.js 346 bytes {0} [built]
    + 88 hidden modules

WARNING in ../~/engine.io/lib/server.js
Critical dependencies:
74:43-65 the request of a dependency is an expression
 @ ../~/engine.io/lib/server.js 74:43-65

当我尝试启动服务器时：

fs.js:977
  return binding.fstat(fd);
                 ^

Error: EBADF: bad file descriptor, fstat
    at Error (native)
    at Object.fs.fstatSync (fs.js:977:18)
    at tryStatSync (fs.js:462:13)
    at fs.readFileSync (fs.js:510:12)
    at Object.<anonymous> (/Users/alexis/Documents/server.js:109:21)
    at __webpack_require__ (/Users/alexis/Documents/server.js:21:30)
    at Object.<anonymous> (/Users/alexis/Documents/server.js:56:34)
    at __webpack_require__ (/Users/alexis/Documents/server.js:21:30)
    at Object.<anonymous> (/Users/alexis/Documents/server.js:48:19)
    at __webpack_require__ (/Users/alexis/Documents/server.js:21:30)

我用：

node：6.7.0
webpack：1.13.2
socket.io:1.5.1

Answer 1

警告来自动态需求，例如：

const test = require('scripts/' + scriptName)

忽略它通常是安全的。 Webpack尝试使用上下文模块来处理动态需求，该模块基本上是与动态需求匹配的所有可能模块的表示。你可以在这里读更多关于它的内容： https://webpack.github.io/docs/context.html

关于错误，如果你不需要将socket.io捆绑在输出包中，你可以将它添加到webpack的外部配置中，webpack会忽略它，但你需要在解决方案中有一个带有socket.io的node_modules文件夹。

所以你的配置将是：

var config = {
  target: "node",
  entry: {
    server: ["server.js"]
  },
  module: {
    loaders: [
      {
        test: /\.(txt|json|osgjs|osgt|bin)$/,
        loader: "file?name=[path][name].[ext]"
      }
    ],
    noParse: ["ws"]
  }
  externals: ["ws", "socket.io"],
  output: {
    path: __dirname,
    filename: "[name].js"
  }
}

module.exports = config;

实际上，最好不要在后端应用程序包中包含node_modules依赖项，并且只有一个webpack插件： https://www.npmjs.com/package/webpack-node-externals

如果您想使用该插件，您的配置将是（在安装webpack-node-externals之后）：

var nodeExternals = require('webpack-node-externals')

var config = {
  target: "node",
  entry: {
    server: ["server.js"]
  },
  module: {
    loaders: [
      {
        test: /\.(txt|json|osgjs|osgt|bin)$/,
        loader: "file?name=[path][name].[ext]"
      }
    ],
    noParse: ["ws"]
  }
  externals: [nodeExternals()],
  output: {
    path: __dirname,
    filename: "[name].js"
  }
}

module.exports = config;

使用webpack显示节点服务器和socket.io

1 个答案: