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    2.0.0 • Public • Published

    Disable Tree Shaking For Chunk Plugin

    GitHub license Build Status npm version

    This plugin for Webpack 5 can disable tree shaking for all modules contained in specified chunks. It is intended to help improve long-term caching and code reuse between project installations and builds.


    This is a Node.js module available through the npm registry. Node 8 and Webpack 4.38 or higher are required.

    Installation is done using the npm install command:

    $ npm install --save-dev disable-tree-shaking-for-chunk-plugin

    Once installed the plugin can be added to your Webpack plugins configuration:

    const DisableTreeShakingForChunk = require('disable-tree-shaking-for-chunk-plugin')
    module.exports = {
      plugins: [
        new DisableTreeShakingForChunk({
          test: 'chunk-name'


    test (string, RegExp, Function, Array, Set)

    Matches the chunk name. It may be a string matched with strict equality, a regular expression for more complex string matching, a function which will receive the chunk name as an argument and should return a boolean, or an array or set of strings.


    Below demonstrates part of a Webpack configuration file which sets up code splitting for a project. It has one cache group defined which will create a separate chunk for each package defined in the array.

    const DisableTreeShakingForChunk = require('disable-tree-shaking-for-chunk-plugin')
    const commonLibraries = ['react', 'redux', 'regenerator-runtime']
    module.exports = {
      optimization: {
        splitChunks: {
          cacheGroups: {
            commonLibraries: {
              test(module) {
                const packageName = getPackageName(module.context)
                return packageName ? commonLibraries.includes(packageName) : false
              name(module) {
                return getPackageName(module.context)
      plugins: [
        new DisableTreeShakingForChunk({
          test: commonLibraries


    By default when running Webpack in production mode it will try to track the properties exported by JavaScript modules and flag when the module is imported and which of those properties is used. It's this clever tracking of "used exports" that enables tree shaking by "pruning" any unused properties. Usually, this is a useful feature as it enables us to ship less code to our users but for cases where we'd like our compiled code to be cached for a long time or be reused by separate applications we need to disable it because how the module may be used over time and by different apps is unknown.

    Prior Art

    This plugin is based upon Webpack's internal FlagInitialModulesAsUsedPlugin by Tobias Koppers.


    This project uses Prettier for automatic code formatting and is tested with Jasmine.


    This package is MIT licensed.


    npm i disable-tree-shaking-for-chunk-plugin

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