Customize Angular Webpack config

add customWebpackConfig to angular.json

{ "projects": { "architect": { "build": { "options": { "customWebpackConfig": { "path": "./custom-webpack.config.js", "replaceDuplicatePlugins": true }, } } } } } 

add the extra webpack plugin config in the custom-webpack.config.js

module.exports = { module: { rules: [ { test: /\.js$/, loader: 'babel-loader', query: { presets: ['@babel/preset-env' ] } } ] } }