如何使反应热装载机与webpack 2和webpackDevMiddleware一起工作？

Question

我使用的是快递中间件，而不是webpack开发服务器：

const config = require("../webpack.config.js");

if(process.env.NODE_ENV === 'development') {
    const webpack = require('webpack');
    const webpackDevMiddleware = require('webpack-dev-middleware');
    const webpackHotMiddleware = require('webpack-hot-middleware');
    const compiler = webpack(config);

    app.use(webpackDevMiddleware(compiler, {
        stats: {colors: true},
    }));
    app.use(webpackHotMiddleware(compiler));
}

我试过react-hot-loader/patch，react-hot-loader/babel和react-hot-loader@3的react-hot-loader/webpack

module.exports = {
    context: path.join(__dirname, 'client'),
    entry: [
        'webpack-hot-middleware/client',
        'react-hot-loader/patch',
        './entry.less',
        './entry',
    ],
    output: {
        path: path.join(__dirname, 'public'),
        filename: 'bundle.js',
        publicPath: '/',
    },
    module: {
        rules: [
            {
                test: /\.jsx/,
                use: [
                    {
                        loader: 'babel-loader',
                        options: {
                            plugins: ['transform-react-jsx', 'transform-class-properties', 'react-hot-loader/babel'],
                        },
                    },
                    'react-hot-loader/webpack'
                ],
            },

但它们似乎都不起作用。我只收到一条错误消息：

HMR以下模块无法热更新：(需要完全重新加载)这通常是因为模块已经改变(和他们的父母)不知道如何热重新加载自己。有关更多详细信息，请参阅http://webpack.github.io/docs/hot-module-replacement-with-webpack.html。logUpdates @ bundle.js:29964 applyCallback @ bundle.js:29932 (匿名)@ bundle.js:29940 bundle.js:29972 HMR -/client/components/CrawlForm.jsx

让它起作用的诀窍是什么？

注: CSS热加载工作很好，所以我得到了那部分工作。

Answer 1

我花了几天时间才最终破案。下面是我的代码：

Webpack Config对象

const clientConfig = {
  entry: {
    client: [
      'react-hot-loader/patch',
      'webpack-hot-middleware/client',
      'babel-polyfill',
      './src/client/client.js',
    ],
  },
  output: {
    path: path.resolve(__dirname, './build/public'),
    filename: '[name].js',
    publicPath: '/',
  },
  devtool: 'inline-source-map',
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin(),
    new webpack.LoaderOptionsPlugin({
      debug: true,
    }),
    new CopyWebpackPlugin([
      { from: './src/assets/fonts', to: 'fonts' },
      { from: './src/assets/images', to: 'images' },
    ]),
    new webpack.EnvironmentPlugin(['GOOGLE_MAP_API_KEY']),
  ],
  module: {
    rules: [
      {
        test: /(\.js|\.jsx)$/,
        loader: 'babel-loader',
        exclude: /node_modules/,
        options: {
          presets: [['es2015', { loose: true }], 'react', 'stage-2'],
        },
      },
      {
        test: /\.scss$/,
        use: [
          'style-loader',
          'css-loader',
          'sass-loader',
        ],
      },
    ],
  },
};

服务器index.js

我和您一样使用开发中间件和热中间件。我也是导入AppContainer从反应热加载和包装我的组件。

import express from 'express';
import React from 'react';
import routes from 'components/Routes';
import html from './html';
import { renderToString } from 'react-dom/server';
import { match, RouterContext } from 'react-router';
import { Provider } from 'react-redux';
import makeStore from 'store';
import Immutable from 'immutable';
import setupNameless from './setupNameless';
import db from './database';
import { actions } from '../client/constants';
import webpack from 'webpack';
import webpackHotMiddleware from 'webpack-hot-middleware';
import webpackDevMiddleware from 'webpack-dev-middleware';
import { clientConfig as wpConfig } from '../../webpack.config.js';
import { AppContainer } from 'react-hot-loader';
import dotenv from 'dotenv';

dotenv.config();

const compiler = webpack(wpConfig);

db();

const app = express();
app.use(webpackDevMiddleware(compiler, {
  publicPath: wpConfig.output.publicPath,
  // noInfo: true,
  stats: {
    colors: true,
  },
}));
app.use(webpackHotMiddleware(compiler));
app.use(express.static('build/public'));

const { commander: nameless, apiPrefix } = setupNameless(app);

app.use((req, res, next) => {
  // make DB call here to fetch jobs.
  nameless.exec('jobs', actions.GET_JOBS).then((jobs) => {

    const store = makeStore(Immutable.fromJS({
      // filters: {},
      app: {
        apiPrefix,
        search: {
          query: '',
          options: {},
        },
      },
      jobs,
    }));

    match({
      routes,
      location: req.originalUrl,
    }, (error, redirectLocation, renderProps) => {
      if (error) {
        res.status(500).send(error.message);
      } else if (redirectLocation) {
        res.redirect(302, redirectLocation.pathname + redirectLocation.search);
      } else if (renderProps) {
        // You can also check renderProps.components or renderProps.routes for
        // your "not found" component or route respectively, and send a 404 as
        // below, if you're using a catch-all route.
        try {
          res.status(200).send(html(renderToString(
            <AppContainer>
              <Provider store={store}>
                <RouterContext {...renderProps} />
              </Provider>
            </AppContainer>
          ), store.getState()));
        } catch (err) {
          next(err);
        }
      } else {
        res.status(404).send('Not found');
      }
    });
  }, (e) => {
    next(e);
  }).catch(e => {
    next(e);
  });
});

app.use(logErrors);

function logErrors(err, req, res, next) {
  console.error(err.stack);
  next(err);
}

app.listen(process.env.PORT || 3000, () => {
  console.log(`App listening on port ${process.env.PORT || 3000}`);
});

Client.js

这就是让它发挥作用的魔法。我必须添加if (module.hot)代码，还必须从react热加载程序导入AppContainer。另一个重要方面是将key={Math.random()}添加到我的<Router />组件中。

import { match, Router, browserHistory as history } from 'react-router';
import routes from './components/Routes';
import ReactDOM from 'react-dom';
import React from 'react';
import { Provider } from 'react-redux';
import makeStore from './store';
import Immutable from 'immutable';
import createLogger from 'redux-logger';
import createSagaMiddleware from 'redux-saga';
import sagas from './sagas';
import { AppContainer } from 'react-hot-loader';

const logger = createLogger();
const sagaMiddleware = createSagaMiddleware();

const store = makeStore(
    Immutable.fromJS(window.__INITIAL_STATE__),
    logger,
    sagaMiddleware
);

sagaMiddleware.run(sagas);

ReactDOM.render(
  <AppContainer>
    <Provider store={store}>
      <Router history={history} routes={routes} />
    </Provider>
  </AppContainer>,
  document.getElementById('app'));

if (module.hot) {
  module.hot.accept('./components/Routes', () => {
    const nextRoutes = require('./components/Routes').default;
    ReactDOM.render(
      <AppContainer>
        <Provider store={store}>
          <Router key={Math.random()} history={history} routes={nextRoutes} />
        </Provider>
      </AppContainer>,
      document.getElementById('app'));
  });
}

祝好运

Answer 2

我在获得要呈现运行时错误的错误覆盖以及从中恢复时遇到了一些困难。我注意到，当发生错误时，webpack-dev-server会执行完全重新加载。

这可以用以下代码片段来模拟：

if (module.hot) module.hot.accept('./App', () => {
  try {
    render(App)
  } catch (e) {
    location.reload();
  }
});

我的工作反应叉-热板可以在Github上使用。

Answer 3

我还把所有的点都添加到我的应用程序中，但是它不起作用--问题是在我的webpack.config.js中出现了问题

publicPath: '/client/dist'

然后我改变了

publicPath: '/'

现在它起作用了