Webpack-css-themes-plugin

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Intro

Compile once and output multiple theme style sheets

• Support webpack multiple entries
• Support sass/less
• Theme files can contain rules other than variables
• Theme files can refer to other files, including file in node_modules
• Build on demand, theme file will be injected into the style files used by project
• Support asynchronous chunks
• Support HMR

This project is inpired by mini-css-extract-plugin

This should support ant-design, element-ui, which provide source style code in dist packages

Comparison

Compare with Ant-Design's offical theme solution

1. Support output multi-theme css in one compile
2. compile on demand, not fully compile css(using Umi 3)
3. use webpack build chain to get full style post-process support like post-css and minify

Requirement

• Webpack: \^5.45.1
• less-loader: "\^8.0.0"
• sass-loader: "\^12.0.0"

Older version

If you're using webpack@4, try webpack-css-themes-plugin@1.0.0

• Webpack: \^4.4.0
• less-loader: "\^6.0.0"
• sass-loader: "\^8.0.0"

If you're using webpack@3, try webpack-css-themes-plugin-legacy

How to Use

1. webpack config

const WebpackCSSThemesPlugin = require('webpack-css-themes-plugin')

const ExcludeAssetsPlugin = require('@ianwalter/exclude-assets-plugin')
// html-webpack-plugin < 4.X
// const HtmlWebpackExcludeAssetsPlugin = require('html-webpack-exclude-assets-plugin');

const HtmlWebpackPlugin = require('html-webpack-plugin')

// if you need to enable hmr for this plugin
process.env.NODE_ENV = 'development'

module.exports = {
  module: {
    rules: [
      {
        test: /\.less$/i,
        use: [
          'css-loader',
          {
            loader: 'less-loader',
            options: {
              lessOptions: {
                javascriptEnabled: true
              }
            },
          }
        ],
      },
      {
        test: /\.css$/i,
        use: 'css-loader'
      }
    ],
  },
  plugins: [
    new WebpackCSSThemesPlugin({
      themes: [{
        name: 'default',
        entryPath: path.resolve(__dirname, 'src/theme/index.less')
      }]
    }),
    // exclude css inject
    new HtmlWebpackPlugin({
      excludeAssets: [/\.css$/],
      template: path.resolve(__dirname, './index.html'),
    }),
    new ExcludeAssetsPlugin()
  ],
}

Notice

1. This plugin replaces extract-text-plugin/mini-css-extract-plugin, please do not use it together.
2. If you use html-webpack-plugin, you need to filter out the CSS injection.

Get more usage from test cases.

2. use import on demand of your component framework

Take antd for example, you must import styles as less format. A common mistake would be importing multiple copied of styles that some of them are css format to override the less styles.

If you import styles by specifying the style option of babel-plugin-import, change it from 'css' to true, which will import the less version of antd.

If you import styles from 'antd/dist/antd.css', change it to antd/dist/antd.less.

3. Do not to reference theme file in the project, it will automatic inject to every less/sass file in your project

4. load/switch built theme css file

you can use webpack-theme-set

import themeSetter from 'webpack-theme-set'
// inital set Theme
themeSetter.setTheme('light', {
  prefix: 'main-'
}).then(() => {
   ReactDOM.render(.....)
})
// switch Theme
themeSetter.setTheme('light')

or your can load it yourself. just insert/remove style DOM to make it work.

Options

themes

Type: Array<theme>

• theme.name(Type string?): name of your theme, required when using less/sass mix compile.
• theme.entryPath(Type string): absolute path of your theme entry, pass in object with less: {lessThemePath} and sass: {sassThemePath} when using less/sass mix compile.
• theme.distFilename(Type string?): output file name for your theme, default: [name].css.

pre-processor

Type: string | Array

less or sass, default less.

pass in ['less', 'sass'] when using less/sass mix compile.

publicPath

Type: String|Function

It will be the publicPath of the project by default.

When is a function, and the input parameters are:

• resourcePath: absolute path of resourcePath
• rootContext: webpack's resource Context