Doesn't seem to work when module re-exporting is involved

[priyajeet]

I forked your repo, and changed the layout a bit.

You can see it here
https://github.com/priyajeet/babel-webpack-tree-shaking

Essentially added index.js to both app folder and at the root level that now serves as the main entry. Hopefully I didn't configure it incorrectly. Module re-exporting I think is a norm when dealing with lots of components being distributed as a library. Realistically, index.js at the root level will again re-export like export * from './app' when the whole project is being distributed as an npm bundle so that the host project does import {SportsCar} from 'babel-webpack-tree-shaking' and then this host project will end up including everything. For the sake of this example, it serves as the main entry point.

[priyajeet]

I do notice that once the babel-loader is removed from the webpack rules, then tree shaking happens fine. But unfortunately you need that loader, for say React etc.