Webpack - 构建无依赖包

Question

I;m wondering if it's possible to build a bundle with some javascript files but without dependencies?

I want to have small bundles with React components (each react component in my case is builded from few react components, for example Comment component incldues comment box, list, and form), I can split React components to a separate files by specifying few entry points in webpack, but if I have: 1. Component comment 2. Component newsletter and both of them require ReactDOM, files which will be generated will have like 600kb, where my react components contain only ~100 lines of js code.

I would like to have one more file which will contain all the code which would come from "require('react-dom'), and those two files which will only have the React component code. is that possible?

My current setup:

'use strict';
import path from 'path';
import CommonsChunkPlugin from "webpack/lib/optimize/CommonsChunkPlugin";
module.exports = {
    entry: {
        app: "./app.js",
        newsletter: "./components/renderers/newsletter.renderer.js",
        comment: "./components/renderers/comment.renderer.js"
    },
    output: {
        path: path.join(__dirname),
        filename: "built/[name].entry.js"
    },
    devtool: 'sourcemaps',
    cache: true,
    debug: true,
    module: {
        loaders: [
            {
                test: /\.jsx?$/,
                exclude: [/(node_modules)/],
                loader: 'babel'
            }
        ],
        resolve: {
            extensions: ['', '.js', '.jsx']
        }
    },
    plugins: [
        new CommonsChunkPlugin({
            name: "comment.js",
            chunks: ["comment", "app"],
            minChunks: 2
        }),
        new CommonsChunkPlugin({
            name: "newsletter.js",
            chunks: ["newsletter", "app"],
            minChunks: 2
        })
    ]
};

Comment.renderer.js:

import CommentBox from './../comment/commentBox';
ReactDOM.render(
    <CommentBox/>,
    document.getElementById("comment")
);

Newsletter.renderer.js:

import Newsletter from './../newsletter/newsletter';
ReactDOM.render(
    <Newsletter/>,
    document.getElementById("newsletter")
);

app.js:

'use strict';
import React from 'react';
import ReactDOM from 'react-dom';
import client from './lib/client';

Answer 1

I use following code in webpack.config.js to exclude the external dependencies from bundle.

module.exports = {
     ...
     ...
    externals:{
       "react": "React",
       "react-dom": "ReactDOM"
     },
     ...
     ...
}

I found this answer from this link

Answer 2

Ok I've managed how to do that:

import path from 'path';
import CommonsChunkPlugin from "webpack/lib/optimize/CommonsChunkPlugin";
module.exports = {
    entry: {
        vendor: ["react","react-dom", "underscore"],
        comment: "./components/renderers/comment.renderer.js",
        newsletter: "./components/renderers/newsletter.renderer.js"
    },
    output: {
        path: path.join(__dirname),
        filename: "built/[name].bundle.js"
    },
    devtool: 'sourcemaps',
    cache: true,
    debug: true,
    module: {
        loaders: [
            {
                test: /\.jsx?$/,
                exclude: [/(node_modules)/],
                loader: 'babel'
            }
        ],
        resolve: {
            extensions: ['', '.js', '.jsx']
        }
    },
    plugins: [
        new CommonsChunkPlugin({
            name: "vendor",
            minChunks: Infinity
        })
    ]
};

this part:

minChunks: Infinity

will ensure that code included in bundle "vendor" is not included in any other bundle. Thanks to this approach, comment and newsletter will contain only my React components.

Answer 3

To complement @AnandShanbhag's answer, you can take all the dependencies from package.json and turn them into externals with a function:

module.exports = {

    ...

    // put everything inside package.json dependencies as externals
    externals: Object.keys(require('./package.json').dependencies)
        .reduce(
            function (acc, cur) {
                acc[cur] = cur
                return acc
            },
            new Object()
        ),

    ...

}