I think resistance to pre-processing is futile. Most people already use it for minification at the very least. With things like brunch and grunt, pre-processing

I think resistance to pre-processing is futile. Most people already use it for minification at the very least. With things like brunch and grunt, pre-processing can be pretty much transparent during development. I actually don't know what sweet.js's sourcemap story is, but potentially transparency could more or less be achieved even during debugging. Maybe we'll eventually even get native JS macro language support!