This repo compares how using "sideEffects": false reduces bundle size for Angular.
It includes a vendor chunk to add indirection to module loading. This prevents Webpack 3 with UglifyJS from dropping the unused Angular imports but Webpack 4 side effect detection can still remove used code.
cd webpack-3
npm i
npm start
# source-map-explorer will open on your browser, with all of Angular
cd ../webpack-4
npm i
npm start
# source-map-explorer will open on your browser, with all of Angular still
Webpack 3 bundle sizes:
-rw-r--r-- 1 kamik 197609 790 Jan 5 17:16 main.js
-rw-r--r-- 1 kamik 197609 666K Jan 5 17:16 vendor.js
Webpack 4 bundle sizes:
-rw-r--r-- 1 kamik 197609 825 Jan 5 17:40 main.js
-rw-r--r-- 1 kamik 197609 652K Jan 5 17:40 vendor.js
MIT