HTML Webpack Combine Multiple Configs Plugin

This plugin allows script assets from multiple webpack configs to be injected into the same HTML template via HtmlWebpackPlugin.

This is useful when using two babel-env targets for legacy and esmodules browsers. That's why this plugin can also alter script tags to include either type="module" or nomodule. This behavior is opt-in. See examples for more. Note that you will also need a nomodule fix for Safari 10.1 in that case.

Based on this gist. See this issue on GitHub for more. Unlike the code found there, this plugin does not contain a race condition that sometimes caused invalid HTML to be generated¹.

Install

npm install --save-dev html-webpack-combine-multiple-configs-plugin

or just grab the source directly and modify it to your needs.

Usage

module.exports = [
  {
    ...config1,
    plugins: [
      new HtmlWebpackPlugin(),
      new HtmlWebpackCombineMultipleConfigsPlugin(),
    ],
  }, 
  {
    ...config2,
    plugins: [
      // Make sure each config has its own instance!
      // Do not share plugins between configs!
      new HtmlWebpackPlugin(),
      new HtmlWebpackCombineMultipleConfigsPlugin(),
    ], 
  },
]

Compatibility

This library was tested against html-webpack-plugin@4.0.0-beta.8 only. Buyer beware.

Footnotes

1. Technically it does contain the same race condition because it's outside the scope of this plugin to fix it. However, since this plugin waits for all configs to contribute their assets before proceeding to render the HTML, it won't matter in practice because the output will be the same regardless of which compilation finishes first. To be extra careful you can provide a unique filename to each HtmlWebpackPlugin. ↩