javascript - 等到 Webpack 开发服务器准备就绪

Question

要求

我需要运行 webpack-dev-server 并等待服务器准备好提供页面。

解决方案

// Start a webpack-dev-server
new WebpackDevServer(webpack(myConfig), {
    publicPath: myConfig.output.publicPath,
    hot: true,
    historyApiFallback: true,
    // It suppress error shown in console, so it has to be set to false.
    quiet: false,
    // It suppress everything except error, so it has to be set to false as well
    // to see success build.
    noInfo: false,
    stats: {
        // Config for minimal console.log mess.
        assets: false,
        colors: true,
        version: false,
        hash: false,
        timings: false,
        chunks: false,
        chunkModules: false
    }
}).listen(3000, '0.0.0.0', function(err) {
    if(err) throw new gutil.PluginError('webpack-dev-server', err);
    gutil.log('[webpack-dev-server]', 'http://0.0.0.0:3000/webpack-dev-server/index.html');
    //this is to ensure that end to end test wouldn't start running until the server is ready
    http.get({
        hostname: '0.0.0.0',
        port: 3000,
        path: '/',
        agent: false  // create a new agent just for this one request
    }, (/*res*/) => {
        // Do stuff with response
        done();
    });
});

问题

在 Linux 上等待服务器准备就绪。在 Windows 上我得到一个异常，因为没有等待并且服务器没有准备好

C:\development\ucms-react>gulp webpack-dev-server [11:03:01] Requiring external module babel-register [11:03:07] Using gulpfile C:\development\ucms-react\gulpfile.babel.js [11:03:07] Starting 'webpack-dev-server'... [11:03:07] [webpack-dev-server] http://0.0.0.0:3000/webpack-dev-server/index.html error events.js:141 throw er; // Unhandled 'error' event ^

Error: connect EADDRNOTAVAIL 0.0.0.0:3000 at Object.exports._errnoException (util.js:907:11) at exports._exceptionWithHostPort (util.js:930:20) at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1077:14)

C:\development\ucms-react>

我该如何解决这个问题？

Answer 1

Brett DeWoody 的另一个答案部分正确。它会正确地等到服务器启动。但是，这不会等待创建 bundle 。因此，如果此时您向 webpack 请求一个页面，它会返回类似于“仍在编译”的内容。

---

要在尝试访问页面之前等待包完全编译(并且服务器正在监听)，您需要这样的东西:

function makeServer(config) {
  return new Promise((resolve, reject) => {
    const compiler = webpack(config);

    let compiled = false;
    let listening = false;

    compiler.hooks.done.tap('IDoNotUnderstandWhatThisStringIsForButItCannotBeEmpty', () => {
      // console.log('compiled');

      if (listening) resolve(server);
      else compiled = true;
    });

    const server = new WebpackDevServer(compiler, config.devServer);

    server.listen(port, '0.0.0.0', err => {
      if (err) return reject(err);

      // console.log('listening');

      if (compiled) resolve(server);
      else listening = true;
    });
  });
}

然后，就像Brett的回答一样，await结果:

var server = await makeServer(config);

或者没有async/await:

makeServer(config).then(server => {
  // Do something with server
});