Find dependencies to transpile with Babel.
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Find dependencies to transpile with Babel.

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A webpack helper to find dependencies of your project that require transpilation with Babel (and babel-preset-env) by comparing your minimum Node.js engine against theirs (engines in package.json), and/or by determining their minimum Node.js engine or published ES2015/ES6+ source (module/jsnext:main in package.json) to require features provided by plugins and polyfills from babel-preset-env.

This mainly aims to solve errors during minification in production builds, since some ES2015+ features like arrow functions are unsupported by the native UglifyJS webpack plugin through at least 3.x. See issues below for examples of this error and affected modules.

This module generates regular expressions to be used in the exclude or include properties of your babel-loader rule in your configuration.


yarn add -D webpack-babel-env-deps (copy)


npm install -D webpack-babel-env-deps (copy)


import babelEnvDeps from 'webpack-babel-env-deps'

export default {
  module: {
    rules: [
        test: /\.js$/,
        exclude: [
          babelEnvDeps.exclude() // returns /node_modules(?!(/|\\)(detect-indent|request|...)(/|\\))/
        use: {
          loader: 'babel-loader',
          // specify options here or in `.babelrc`
          options: {
            presets: [
              ['env', {
                targets: {
                  browsers: ['> 1%, last 2 versions, Firefox ESR'],
                  uglify: true


Functions exclude amd include accept an optional options object with following properties:



Optional. This should match your resolve.mainFields if you specify it in your webpack config, else it assumes the default of ['browser', 'module', 'main']. This is used to determine modules published with ES2015+ module support as module/jsnext:main, which by default webpack will load in preference to main, so that its engines field probably reflects main support rather than module/jsnext:main support, so we must assume we must transpile the module/jsnext:main version.


?array | ?string | ?function

Optional. This adds exceptions to the inclusion or exclusion rules. For example, include({ except: ['foo'] }) will prevent foo from being included for transpilation even if it would normally meet the criteria. And exclude({ except: ['foo'] }) will include foo for transpilation even if it doesn't otherwise meet transpilation criteria.


?object | ?boolean

Optional. This optionally overrides the engines key in your package.json. Or set to false to suppress any use of your engines for determining dependencies to transpile.


?object | ?boolean

Optional. Default is false. This optionally provides the engines key when missing from any dependencies. For example, exclude({ defaultEngines: { 'node': '>= 4' } }) will assume that dependencies without engines require node 4, and determine transpilation normally. Or set to true to enable transpilation for dependencies without enough information. For example, exclude({ defaultEngines: true }).