WebPack loads all semantic-ui components

问题

I'm currently working on a project and i need to configure WebPack. In the project, we are also using ReactJS and Semantic-UI. Here is webpack.config.js :

var path = require("path");
var webpack = require('webpack');
var BundleTracker = require('webpack-bundle-tracker');
var BundleAnalyzer = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

module.exports = {

    context: __dirname,
    entry: {
        react: ["react", "react-dom"],
        home: './assets/js/index.jsx',
    },
    output: {
        path: path.resolve('./assets/bundles/'),
        filename: "[name].js",
    },
    plugins: [
        new BundleTracker({filename: './webpack-stats.json'}),

        new webpack.optimize.CommonsChunkPlugin({
            names: ["react"],
        }),

        new webpack.optimize.CommonsChunkPlugin({
            name: "home",
            chunks: ['home'],
            filename: "[name]-[hash].js",
        }),
        new BundleAnalyzer(),
    ],

    module: {
        loaders: [
                    { 
                      test: /\.jsx?$/,
                      exclude: /node_modules/,
                      loader: 'babel-loader',
                      options: { presets: ["es2015", "react"] }
                    },
                 ],
    },

    resolve: {
        modules: ['node_modules', 'bower_components'],
        extensions: ['*', '.js', '.jsx']
    },
};

In assets/js/index.jsx file, we just have these import statements :

import React from "react";
import ReactDOM from 'react-dom';
import { Button } from 'semantic-ui-react';

By running webpack command, it outputs two files:

react.js: 779 KB
home-[some_hash_number].js: 1.5 MB

Using webpack-bundle-analyzer plugin, we get this:

As you see the red rectangle in the picture, all of the semantic-ui react components are bundled into home.js file although i just imported Button component from in assets/js/index.js file and that's why the output file gets too big.

Is there any way to just bundle needed components?

UPDATE

Reading @Alexander Fedyashov answer, i installed babel-plugin-lodash and updated webpack.config.js accordingly:

var path = require("path");
var webpack = require('webpack');
var BundleTracker = require('webpack-bundle-tracker');
var BundleAnalyzer = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

module.exports = {

    context: __dirname,
    entry: {
        react: ["react", "react-dom"],
        home: './assets/js/index.jsx',
    },
    output: {
        path: path.resolve('./assets/bundles/'),
        filename: "[name].js",
    },
    plugins: [
        new BundleTracker({filename: './webpack-stats.json'}),

        new webpack.optimize.CommonsChunkPlugin({
            name: "react",
        }),

        new webpack.optimize.CommonsChunkPlugin({
            name: "home",
            chunks: ['home'],
            filename: "[name]-[hash].js",
        }),
        new BundleAnalyzer(),
    ],

    module: {
        loaders: [
                    { 
                      test: /\.jsx?$/,
                      exclude: /node_modules/,
                      loader: 'babel-loader',
                      options: {
                            plugins: ["lodash", { "id": ["lodash", "semantic-ui-react"] }],
                            presets: ["es2015", "react"],
                      }
                    },
                 ],
    },

    resolve: {
        modules: ['node_modules', 'bower_components'],
        extensions: ['*', '.js', '.jsx']
    },
};

Now everything is working and only needed components are loaded.

回答1:

It should be splitted by Webpack, but in fact tree shaking doesn't work. You can use babel-plugin-lodash as described in SUIR docs.

You should keep in mind, that some of SUIR's components are dependent from each other, i.e.:

Button requires Icon and Label
Label requires Icon and Image
Image requires Dimmer
Dimmer requires Portal.

However, plugin will allow to strip such components as Rail, Reveal and Advertisement if you don't use them.

回答2:

There is a new feature on Webpack 2 to solve this issue, read this article https://medium.com/@adamrackis/vendor-and-code-splitting-in-webpack-2-6376358f1923

来源：https://stackoverflow.com/questions/45386871/webpack-loads-all-semantic-ui-components

标签

reactjs

Webpack

babeljs

webpack-2

semantic-ui-react