title: Angular 8 CLI: Disable differential loading in development serve
body: <p>Since upgrading to Angular 8, differential loading has been enabled by default in our projects and resulting in a polyfill for both ES5 and ES2015. While I welcome this change very much, is there any way to force ES2015 mode in development mode? I'm trying to shave off any second from the initial and incremental build times, which are exceeding 40 / 8 seconds respectively.</p>