Question

我正在使用快速中间件而不是webpack-dev-server：

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));
}

我已尝试react-hot-loader/patch中的react-hot-loader/babel，react-hot-loader/webpack和react-hot-loader@3：

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。我刚收到此错误消息：

[HMR]以下模块无法热更新:(需要完全重新加载）   这通常是因为已经改变的模块（及其父母）不知道如何热重新加载自己。有关详细信息，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

让它发挥作用的诀窍是什么？

N.B。 CSS热负载工作得很好，所以我得到了那部分工作。

Answer 1

我花了好几天才终于破案。这是我的代码：

Webpack配置对象

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

我正在使用与您相同的开发中间件和热中间件。我还从react-hot-loader导入AppContainer并包装我的组件。

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}`);
});

<强> Client.js

这是让它发挥作用的魔力。我必须添加if (module.hot)代码并从react-hot-loader导入AppContainer。另一个重要方面是将key={Math.random()}添加到我的<Router />组件。

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'));
  });
}

祝你好运

Answer 2

我在获取错误覆盖以呈现运行时错误以及从中恢复时遇到了一些麻烦。我注意到webpack-dev-server在发生错误时会完全重新加载。

可以使用以下代码段模拟这一点：

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

我的工作fork of react-hot-boilerplate可在Github上找到。

Answer 3

从Dan Abramov释义并借用realseanp中的一些代码，完整说明如下：

yarn add react-hot-loader@3
更新webpack.config.js：
1. 将react-hot-loader/patch和webpack-hot-middleware/client添加到entry
2. 将react-hot-loader/babel添加到您的babel-loader plugins
3. 将new HotModuleReplacementPlugin()添加到您的网络包插件

添加webpack-dev-middleware和webpack-hot-middlware以表达：

// server/entry.jsx
const express = require('express');
const path = require('path');
const cons = require('consolidate');
const fs = require('fs');

const port = 5469;
const app = express();

app.disable('x-powered-by');
app.engine('hbs', cons.handlebars);
app.set('view engine', 'hbs');
app.set('views', path.join(__dirname, '../views'));

const wpConfig = 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(wpConfig);

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

app.use(require('./routes'));

app.use(express.static(wpConfig.output.path));

app.listen(port, function () {
    console.log(`Listening on http://localhost:${port}`);
});

将<AppContainer>和react.hot添加到您的客户入口点：

// client/entry.jsx
import ReactDOM from 'react-dom';
import App from './components/App';
import { AppContainer } from 'react-hot-loader';

function render(Root) {
    ReactDOM.render(<AppContainer><Root/></AppContainer>, document.getElementById('react-root'));
}

render(App);

if(module.hot) {
    module.hot.accept('./components/App', () => {
        render(require('./components/App').default);
    });
}

Answer 4

我还在我的应用程序中添加了每个点但它没有用问题发生在publicPath的{{1}} 我有

webpack.config.js

然后我改为

publicPath: '/client/dist'

现在可行了

如何让react-hot-loader与webpack 2和webpackDevMiddleware一起工作？

4 个答案: