RIP. ▸ Xcode extensions are officially supported, and that's good. ▸ Xcode extensions must have a host macOS app, but that app doesn't actually have to do anything. ▸ Xcode extensions are pretty limited. File radars.
please dupe these radars: ▸ Allow callbacks anytime a file with a given extension is edited: http://www.openradar.me/26823522 ▸ No Default key bindings: http://www.openradar.me/28170032 ▸ Can't emit warnings: http://www.openradar.me/28170362