MergeDuplicateChunksPlugin

Merges chunks that contain the same modules. This plugin is enabled by default as part of webpack's internal optimizations. Exporting it publicly allows developers to configure the stage at which merging occurs — useful when chunk merging needs to run after SplitChunksPlugin.

new webpack.optimize.MergeDuplicateChunksPlugin({
  // Options...
});

Options

stage

number

Controls the optimization stage at which duplicate chunk merging runs. By default, merging occurs before SplitChunksPlugin. Setting a higher stage value causes merging to run after other optimizations such as SplitChunksPlugin.

webpack.config.js

import webpack from "webpack";

export default {
  // ...
  plugins: [
    new webpack.optimize.MergeDuplicateChunksPlugin({
      stage: 10, // run after SplitChunksPlugin
    }),
  ],
};