When running webpack, the `index.<hashcode>.js` is only partially built in the first run (`388 kB`)  and later fully compiled (`24.9 MB`) <img width="797" alt="screen shot 2018-04-27 at 11 47 26 am" src="https://user-images.githubusercontent.com/5635322/39379786-3be255ba-4a11-11e8-9f39-c4a674b05171.png"> Is this some optimization that webpack implements? Is there any way to force a complete build at the first run?