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webpack bundle node express with hot reloading=hell

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Trace · 技术社区 · 5 年前

我不想承认,但我已经花了三个漫长的晚上试图去做——我认为这是一件简单的事情。我终于到了我受够了的阶段,坦率地说,我很沮丧,因为“它就是不起作用”。

以下是我努力实现的目标:

将我的Express服务器与Webpack捆绑在一起(尽管我当前的代码只是在浏览器中呈现一个字符串,但它应该编译用babel编译的服务器呈现的react组件)
将包保存在内存中(如果没有其他方法,则保存在磁盘上)
运行webpack/dev/hot中间件为我的node express应用程序提供服务,这样对服务器呈现的页面(将是react组件)的更改将在浏览器中自动更新。

我尝试过许多组合,不推荐使用的教程,不再维护的NPM包,以及下载了不起作用的示例。

这是我当前的设置:

web包.server.config.js:

const path = require('path');
const webpack = require('webpack');
const nodeExternals = require('webpack-node-externals');

module.exports = {
    name: 'server',
    mode: 'development',
    target: 'node',
    externals: nodeExternals(),
    entry: [ './src/server/index' ],
    output: {
        path: path.resolve(__dirname, 'dist'),
        // path: "/",
        filename: '[name].js',
        publicPath: '/assets/',
        libraryTarget: 'commonjs2'
    },
    plugins: [
        new webpack.HotModuleReplacementPlugin()
    ],
    module: {
        rules: [
            {
                test: /.js$/,
                loader: 'babel-loader',
                include: path.resolve(__dirname, 'src/'),
                exclude: /node_modules/,
                options: {
                    presets:
                        [['@babel/preset-env', { modules: 'false' }], '@babel/preset-react'],
                    plugins: [
                        ['@babel/plugin-proposal-object-rest-spread', { useBuiltIns: true }],
                        '@babel/plugin-proposal-class-properties'
                    ]
                }
            },
            {
                test: /\.scss$/,
                loader: 'ignore-loader'
            },
            {
                test: /\.css$/,
                loader: 'ignore-loader'
            },
            {
                test: /\.(jpg|png|svg|gif|pdf)$/,
                loader: 'file-loader',
                options: {
                    name: '[path][name].[ext]'
                }
            }
        ]
    }
};

index.js:

import http from 'http';
import fs from "fs";
import express from "express";
import favicon from 'serve-favicon';
// import renderer from "./renderer";
import renderApp from './welcome';


const app = express();

app.use(favicon('./public/favicon.ico'));
app.use(express.static("public"));


if (process.env.NODE_ENV !== 'production') {

    const webpack = require('webpack');
    const webpackDevMiddleware = require('webpack-dev-middleware');
    const webpackHotMiddleware = require('webpack-hot-middleware');
    const serverConfig = require('../../webpack.server.config');

    const compiler = webpack(serverConfig);

    app.use(webpackDevMiddleware(compiler, {
        stats: {colors: true},
        headers: { "Access-Control-Allow-Origin": "http://localhost"},
        publicPath: serverConfig.output.publicPath
    }));

    app.use(require("webpack-hot-middleware")(compiler));

}

app.get("*", function(req, res) {
    fs.readFile("./src/server/html/index.html", "utf8", function(err, data) {
        const context = {};
        const html = renderApp();
        //const html = renderer(data, req.path, context);

        res.set('content-type', 'text/html');
        res.send(html);
        res.end();
    });
});

const PORT = process.env.PORT || 8080;

app.listen(3000);

坦率地说,我对这应该如何工作也相当困惑。
是否应执行以下步骤?:

webpack webpack.server.config.js——观看
node dist/server.js//webpack输出文件夹

这会神奇地热重新加载我的服务器吗?

欢迎提供所有帮助,或者如果您碰巧有一个可工作的演示。
我就是做不到。

最后,我还将热重新加载(重新呈现)我的客户端包,但我想这将是很容易的一部分,因为我已经看到了许多关于这方面的资源。

0 回复 | 直到 5 年前

Christopher Vickers 5 年前

node.js、babel和webpack一直是我这个月的祸根。应该包括几个组件。您应该有一个名为“package.json”的开始文件。

内容应如下所示:

{
  "name": "react-complete-guide",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "webpack-dev-server",
    "build": "rimraf dist && webpack --config webpack.prod.config.js --progress --profile --color"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "autoprefixer": "^7.1.5",
    "babel-core": "^6.26.0",
    "babel-loader": "^7.1.2",
    "babel-plugin-syntax-dynamic-import": "^6.18.0",
    "babel-preset-env": "^1.6.0",
    "babel-preset-react": "^6.24.1",
    "babel-preset-stage-2": "^6.24.1",
    "css-loader": "^0.28.7",
    "file-loader": "^1.1.5",
    "html-webpack-plugin": "^2.30.1",
    "postcss-loader": "^2.0.7",
    "style-loader": "^0.19.0",
    "url-loader": "^0.6.2",
    "webpack": "^3.6.0",
    "webpack-dev-server": "^2.9.1"
  },
  "dependencies": {
    "react": "^16.0.0",
    "react-dom": "^16.0.0",
    "react-router-dom": "^4.2.2"
  }
}

如果键入“npm start”,则运行代码“start”:“webpack dev server”。这将加载代码预览。要将内容打包到构建中,请键入“npm run build”并运行代码“build”:“rimraf dist&webpack--config webpack.prod.config.js--progress--profile--color”。该代码将运行“rimraf”,删除“dist”文件夹(如果存在),其余运行Webpack配置文件。

您应该有两个Webpack文件。一个用于热重载,一个用于生产环境的包装。应调用这些文件:

“webpack.config.js”和“webpack.prod.config.js”。

“webpack.config.js”的内容如下:

const path = require('path');
const autoprefixer = require('autoprefixer');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
    devtool: 'cheap-module-eval-source-map',
    entry: './src/index.js',
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: 'bundle.js',
        chunkFilename: '[id].js',
        publicPath: ''
    },
    resolve: {
        extensions: ['.js', '.jsx']
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                loader: 'babel-loader',
                exclude: /node_modules/
            },
            {
                test: /\.css$/,
                exclude: /node_modules/,
                use: [
                    { loader: 'style-loader' },
                    { 
                        loader: 'css-loader',
                        options: {
                            importLoaders: 1,
                            modules: true,
                            localIdentName: '[name]__[local]__[hash:base64:5]'
                        }
                     },
                     { 
                         loader: 'postcss-loader',
                         options: {
                             ident: 'postcss',
                             plugins: () => [
                                 autoprefixer({
                                     browsers: [
                                        "> 1%",
                                        "last 2 versions"
                                     ]
                                 })
                             ]
                         }
                      }
                ]
            },
            {
                test: /\.(png|jpe?g|gif)$/,
                loader: 'url-loader?limit=8000&name=images/[name].[ext]'
            }
        ]
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: __dirname + '/src/index.html',
            filename: 'index.html',
            inject: 'body'
        })
    ]
};

“webpack.prod.config.js”的内容如下:

const path = require('path');
const autoprefixer = require('autoprefixer');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const webpack = require('webpack');

module.exports = {
    devtool: 'cheap-module-source-map',
    entry: './src/index.js',
    output: {
        path: path.resolve(__dirname, 'dist/new'),
        filename: 'bundle.js',
        chunkFilename: '[id].js',
        publicPath: ''
    },
    resolve: {
        extensions: ['.js', '.jsx']
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                loader: 'babel-loader',
                exclude: /node_modules/
            },
            {
                test: /\.css$/,
                exclude: /node_modules/,
                use: [
                    { loader: 'style-loader' },
                    { 
                        loader: 'css-loader',
                        options: {
                            importLoaders: 1,
                            modules: true,
                            localIdentName: '[name]__[local]__[hash:base64:5]'
                        }
                     },
                     { 
                         loader: 'postcss-loader',
                         options: {
                             ident: 'postcss',
                             plugins: () => [
                                 autoprefixer({
                                     browsers: [
                                        "> 1%",
                                        "last 2 versions"
                                     ]
                                 })
                             ]
                         }
                      }
                ]
            },
            {
                test: /\.(png|jpe?g|gif)$/,
                loader: 'url-loader?limit=8000&name=images/[name].[ext]'
            }
        ]
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: __dirname + '/src/index.html',
            filename: 'index.html',
            inject: 'body'
        }),
        new webpack.optimize.UglifyJsPlugin()
    ]
};

你还需要一个文件来告诉巴贝尔怎么做。如果您使用babel,则该文件称为“.babelrc”。内容如下

{
    "presets": [
        ["env", {
            "targets": {
                "browsers": [
                    "> 1%",
                    "last 2 versions"
                ]
            }
        }],
        "stage-2",
        "react"
    ],
    "plugins": [
        "syntax-dynamic-import"
    ]
}

这段代码中有很多内容。我强烈建议看一些关于这个的教程视频。

Trace 5 年前

可能需要夜间睡眠。
我使用StartServerPlugin完成了这个工作(包括React服务器呈现的组件)。
以下安装程序将热重新加载节点Express服务器:

const path = require('path');
const webpack = require('webpack');
const nodeExternals = require('webpack-node-externals');
const StartServerPlugin = require('start-server-webpack-plugin');

module.exports = {
    name: 'server',
    mode: 'development',
    target: 'node',
    externals: nodeExternals({
        whitelist: ['webpack/hot/poll?1000']
    }),
    entry: [ 'webpack/hot/poll?1000', './src/server/index' ],
    output: {
        path: path.resolve(__dirname, 'dist'),
        // path: "/",
        filename: 'server.js',
        publicPath: '/assets/',
        libraryTarget: 'commonjs2'
    },
    plugins: [
        new StartServerPlugin({'name': 'server.js', nodeArgs: ['--inspect']}),
        new webpack.NamedModulesPlugin(),
        new webpack.HotModuleReplacementPlugin(),
        new webpack.DefinePlugin({
            "process.env": {
                "BUILD_TARGET": JSON.stringify('server')
            }
        })
    ],
    module: {
        rules: [
            {
                test: /.js$/,
                loader: 'babel-loader',
                include: path.resolve(__dirname, 'src/'),
                exclude: /node_modules/,
                options: {
                    presets:
                        [['@babel/preset-env', { modules: 'false' }], '@babel/preset-react'],
                    plugins: [
                        ['@babel/plugin-proposal-object-rest-spread', { useBuiltIns: true }],
                        '@babel/plugin-proposal-class-properties'
                    ]
                }
            },
            {
                test: /\.scss$/,
                loader: 'ignore-loader'
            },
            {
                test: /\.css$/,
                loader: 'ignore-loader'
            },
            {
                test: /\.(jpg|png|svg|gif|pdf)$/,
                loader: 'file-loader',
                options: {
                    name: '[path][name].[ext]'
                }
            }
        ]
    }
};

index.js:

import http from 'http'
import app from './server'

const server = http.createServer(app)
let currentApp = app;

const PORT = process.env.PORT || 8080;

server.listen(PORT);

if (module.hot) {
    module.hot.accept('./server', () => {
        server.removeListener('request', currentApp);
        server.on('request', app);
        currentApp = app;
    })
}

服务器JS:

import http from 'http';
import fs from "fs";
import express from "express";
import favicon from 'serve-favicon';
import renderer from "./renderer";
import renderApp from './welcome';


const app = express();

app.use(favicon('./public/favicon.ico'));
app.use(express.static("public"));


app.get("*", function(req, res) {
    fs.readFile("./src/server/html/index.html", "utf8", function(err, data) {
        const context = {};
        //const html = renderApp();
        console.log('test');
        const html = renderer(data, req.path, context);
        res.set('content-type', 'text/html');
        res.send(html);
        res.end();
    });
});

export default app;

运行方式:

rm -rf ./dist && webpack --config webpack.server.config.js --watch