package.json中节点和浏览器的不同主要入口点 [英] Different main entry point in package.json for node and browser

问题描述

在同构反应应用程序中，我有 myModule ，它在节点和浏览器环境中的行为应该不同。我想在 package.json 中为 myModule 配置此分割点：

In isomorphic react app I have myModule which should behave differently on node and browser environments. I would like configure this split point in package.json for myModule:

package.json

package.json

{
  "private": true,
  "name": "myModule",
  "main": "./myModule.server.js",
  "browser": "./myModule.client.js"
}

文件结构

file structure

├── myModule
│   ├── myModule.client.js
│   ├── myModule.server.js
│   └── package.json
│ 
├── browser.js
└── server.js

所以当我使用 myModule 在节点我应该只获得 myModule.server.js ：

So when I use myModule in node I should get only myModule.server.js:

server.js

import myModule from './myModule';
myModule(); // invoke myModule.server.js

在浏览器方面仅使用构建捆绑包 myModule.client.js ：

browser.js

import myModule from './myModule';
myModule(); // invoke myModule.client.js

react-starter-kit 使用这种方法，但我无法弄清楚这是什么配置定义。

react-starter-kit uses this approach but I can't figure out where is this configuration defined.

1. package.json 是进行这种拆分的良好语义点。


2. 客户端包只包含 myModule.client.js 。

1. package.json is good semantic point to do this kind of splitting.
2. Client side bundle only contain myModule.client.js.

---

已知解决方案 - 不是我的答案

你可以拥有这种文件结构：

---

Known solution - not an answer for me

You can have this kind of file structure:

├── myModule
│    ├── myModule.client.js
│    ├── myModule.server.js
│    └── index.js           <-- difference
│ 
├── browser.js
└── server.js

并且在 index.js ：

if (process.browser) { // this condition can be different but you get the point
    module.exports = require('./myModule.client');
} else {
    module.exports = require('./myModule.server');
}

这个问题的主要问题是客户端包包含很多heavy kB后端代码。

The main problem with this is that client bundle contains a lot of heavy kB backend code.

我包含我的 webpack.config.js 。奇怪的是，此配置始终指向浏览器和节点的 myModule.client.js 。

I include my webpack.config.js. Strangely this config always point to myModule.client.js for browser and node.

const webpack = require('webpack');
var path = require('path');
var fs = require('fs');

const DEBUG = !process.argv.includes('--release');
const VERBOSE = !process.argv.includes('--verbose');
const AUTOPREFIXER_BROWSERS = [
    'Android 2.3',
    'Android >= 4',
    'Chrome >= 35',
    'Firefox >= 31',
    'Explorer >= 9',
    'iOS >= 7',
    'Opera >= 12',
    'Safari >= 7.1',
];

let nodeModules = {};
fs.readdirSync('node_modules')
    .filter(function(x) {
        return ['.bin'].indexOf(x) === -1 ;
    })
    .forEach(function(mod) {
        nodeModules[mod] = 'commonjs ' + mod;
    });

let loaders = [
    {
        exclude: /node_modules/,
        loader: 'babel'
    },
    {
        test: [/\.scss$/,/\.css$/],
        loaders: [
            'isomorphic-style-loader',
            `css-loader?${DEBUG ? 'sourceMap&' : 'minimize&'}modules&localIdentName=` +
            `${DEBUG ? '[name]_[local]_[hash:base64:3]' : '[hash:base64:4]'}`,
            'postcss-loader?parser=postcss-scss'
        ]
    },
    {
        test: /\.(png|jpg|jpeg|gif|svg|woff|woff2)$/,
        loader: 'url-loader',
        query: {
            name: DEBUG ? '[name].[ext]' : '[hash].[ext]',
            limit: 10000,
        },
    },
    {
        test: /\.(eot|ttf|wav|mp3)$/,
        loader: 'file-loader',
        query: {
            name: DEBUG ? '[name].[ext]' : '[hash].[ext]',
        },
    },
    {
        test: /\.json$/,
        loader: 'json-loader',
    },
];

const common = {
    module: {
        loaders
    },
    plugins: [
        new webpack.optimize.OccurenceOrderPlugin(),
    ],
    postcss: function plugins(bundler) {
        var plugins = [
            require('postcss-import')({ addDependencyTo: bundler }),
            require('precss')(),
            require('autoprefixer')({ browsers: AUTOPREFIXER_BROWSERS }),
        ];

        return plugins;
    },
    resolve: {
        root: path.resolve(__dirname, 'src'),
        extensions: ['', '.js', '.jsx', '.json']
    }
};


module.exports = [
    Object.assign({} , common, { // client
        entry: [
            'babel-polyfill',
            './src/client.js'
        ],
        output: {
            path: __dirname + '/public/',
            filename: 'bundle.js'
        },
        target: 'web',
        node: {
            fs: 'empty',
        },
        devtool: DEBUG ? 'cheap-module-eval-source-map' : false,
        plugins: [
            ...common.plugins,
            new webpack.DefinePlugin({'process.env.BROWSER': true }),
        ],
    }),
    Object.assign({} , common, { // server
        entry: [
            'babel-polyfill',
            './src/server.js'
        ],
        output: {
            path: __dirname + '',
            filename: 'server.js'
        },
        target: 'node',
        plugins: [
            ...common.plugins,
            new webpack.DefinePlugin({'process.env.BROWSER': false }),
        ],
        node: {
            console: false,
            global: false,
            process: false,
            Buffer: false,
            __filename: false,
            __dirname: false,
        },
        externals: nodeModules,

    })
];

推荐答案

自问这个问题已经很久了。我只是想澄清之前的答案。

It has been a long time since this question was asked. I just want to clarify the previous answer.

如果你看一下React Starter Kit中的tools / webpack.config.js，你会得到
看到它导出两个略有不同的Webpack配置，例如
module.exports = [clientConfig，sererConfig]。服务器端
bundle config将此字段目标设置为node（默认为web）。

If you look at tools/webpack.config.js in React Starter Kit you will see that it exports two Webpack configurations that slightly differ, e.g. module.exports = [clientConfig, sererConfig]. The server-side bundle config has this field target set to node (by default it's web).

这似乎是这个webpack heavyior没有记录，但是当目标是'node'时，webpack会自动进入'main'条目，当target为'web'时，webpack会自动进入'browser'。

It seems this webpack heavior is not documented, but webpack automatically takes 'main' entry when target is 'node' and takes 'browser' entry when target is 'web'.

这篇关于package.json中节点和浏览器的不同主要入口点的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！