Question

我正在运行一个快速服务器，它将作为我的React应用程序的API，该应用程序由webpack-dev-server捆绑并提供服务。

我正在尝试让热模块替换工作，并且几乎在那里，当我对我的文件进行更改时，我在控制台中得到了这个：

.join()

但除非手动刷新，否则永远不会重新呈现该应用。不知道这是否相关，但是当我更新我的.scss文件时，它会刷新而不会手动执行，并且会按照我的预期进行更新。

版本：

"webpack": "2.1.0-beta.22"

"webpack-dev-server": "2.1.0-beta.8"

"react-hot-loader": "3.0.0-beta.5"

我尝试了最新的webpack，但它给了我无法克服的验证错误。

我正在通过"webpack": "webpack-dev-server --port 4000 --env.dev"运行webpack，我的快速服务器正在http://localhost:3000上运行。

这是我的webpack.config.babel.js：

const webpack = require('webpack');
const { resolve, join } = require('path');
const { getIfUtils, removeEmpty } = require('webpack-config-utils')

const getEntry = (ifDev) => {
  let entry

  if (ifDev) {
    entry = {
      app: [
        'react-hot-loader/patch',
        'webpack/hot/dev-server',
        'webpack-dev-server/client?http://localhost:4000/',
        './js/index.js'
      ],
      vendor: ['react']
    }
  } else {
    entry = {
      bundle: './js/index.js',
      vendor: ['react']
    }
  }

  return entry
}

const config = env => {
  const { ifProd, ifDev } = getIfUtils(env)

  return {
    entry: getEntry(ifDev),
    output: {
      path: resolve('./public/dist/'),
      publicPath: 'http://localhost:4000/',
      filename: '[name].bundle.js',
    },
    context: resolve(__dirname, 'assets'),
    devtool: env.prod ? 'source-map' : 'eval',
    devServer: {
      contentBase: resolve('./public/dist/'),
      headers: { 'Access-Control-Allow-Origin': '*' },
      publicPath: 'http://localhost:4000/',
      hot: true,
      noInfo: true,
      inline: true
    },
    bail: env.prod,
    module: {
      loaders: [
        { test: /\.scss$/, loaders: [ 'style', 'css', 'sass' ], exclude: /node_modules|lib/ },
        { test: /\.(js|jsx)$/, exclude: /node_modules/, loaders: [ 'babel-loader' ] },
        { test: /\.(ttf|eot|svg|woff(2)?)(\?[a-z0-9=&.]+)?$/, loader: 'file-loader' }
      ]
    },
    resolve: {
      extensions: ['.js', '.jsx']
    },
    plugins: removeEmpty([
      ifDev(new webpack.NoErrorsPlugin()),
      ifDev(new webpack.NamedModulesPlugin()),
      ifDev(new webpack.HotModuleReplacementPlugin()),

      new webpack.DefinePlugin({
        'process.env': { NODE_ENV: JSON.stringify((env.prod) ? 'production' : 'development') }
      }),
      new webpack.optimize.CommonsChunkPlugin({
        name: 'vendor',
        minChunks: Infinity,
        filename: 'vendor.bundle.js'
      }),

      ifProd(new webpack.LoaderOptionsPlugin({
        minimize: true,
        debug: false
      })),
      ifProd(new webpack.optimize.UglifyJsPlugin({
        compress: { warnings: false },
        output: { comments: false },
        sourceMap: false
      }))
    ]),
  }
}

module.exports = config

以下是我的.babelrc，我致电react-hot-loader

{
  "presets": [["es2015", { modules: false }], "stage-0", "react"],
  "plugins": ["react-hot-loader/babel"],
  "env": {
    "test": {
      "plugins": ["istanbul"],
      "presets": ["es2015", "stage-0", "react"]
    }
  },
  "sourceMaps": "inline"
}

Answer 1

使用React Hot Loader v3和Babel转换，您希望在组件的根目录（渲染的位置或创建Redux提供程序的位置）执行此操作：

render(
  <AppContainer>
    <Root
      store={ store }
    />
  </AppContainer>,
  document.getElementById('root')
);

if (module.hot) {
  module.hot.accept('./containers/Root', () => {
    const RootContainer = require('./containers/Root').default;
    render(
      <AppContainer>
        <RootContainer
          store={ store }
        />
      </AppContainer>,
      document.getElementById('root')
    );
  });
}

使用新版本的Hot Loader，您必须明确接受module.hot.accept的热门更新。

在一个更复杂的Redux项目中（使用路由和热重载减速器），您可以执行以下操作：

/**
 * Starts the React app with the Router, and renders it to the given DOM container
 * @param  {DOMElement} container
 */
export default function app(container) {
  const store = createStore(
    combineReducers({
      ...reducers,
      routing: routerReducer,
      form: formReducer,
    }),
    compose(
      applyMiddleware(
        routerMiddleware(hashHistory),
        thunkMiddleware,
        promiseMiddleware
      ),
      process.env.NODE_ENV !== 'production' && window.devToolsExtension ? window.devToolsExtension() : (param) => param
    )
  );

  if (module.hot) {
    module.hot.accept('./reducers', () => {
      const nextReducers = require('./reducers');
      const nextRootReducer = combineReducers({
        ...nextReducers,
        routing: routerReducer,
        form: formReducer,
      });
      store.replaceReducer(nextRootReducer);
    });
  }

  const history = syncHistoryWithStore(hashHistory, store);

  render({ store, history, container });

  store.dispatch(loadEventsWhenLoggedIn());

  if (module.hot) {
    module.hot.accept('./render', () => {
      const newRender = require('./render').default;
      newRender({ store, history, container });
    });
  }
}

（和render.js）

/**
 * Starts the React app with the Router, and renders it to the given DOM container
 * @param  {DOMElement} container
 */
export default function render({ store, history, container }) {
  ReactDOM.render(
    <Provider store={store}>
      <div className='container'>
        <Routes history={history} store={store} />
      </div>
    </Provider>,
    container
  );
}

有关更多示例，您应该查看Dan Abramov的Redux devtools示例仓库，例如此文件：https://github.com/gaearon/redux-devtools/blob/master/examples/todomvc/index.js

Answer 2

HMR自动为CSS工作，因为style-loader支持开箱即用。

React并非如此。您需要react-hot-loader。

使用npm安装它，然后更改：

{ test: /\.(js|jsx)$/, exclude: /node_modules/, loaders: [ 'babel-loader' ] },

要：

{ test: /\.(js|jsx)$/, exclude: /node_modules/, loaders: [ 'react-hot-loader', 'babel-loader' ] },

如果您想了解更多信息，建议您阅读“Webpack’s HMR & React-Hot-Loader — The Missing Manual”。

热模块更换 - 更新但不重新渲染

2 个答案: