sencha package build with cmd 5

I'm upgrading from Sencha Cmd 4 to 5, using Sencha Touch 2.4.

In the past, I used "sencha ant -Dbuild.environment=package build" (to prepare the app to be included in a Cordova project).

What's the equivalent with Cmd 5? When I try it, it seems to work, but the resulting build contains "archive" and "deltas", which don't belong in a package build.

I read somewhere that the "package" build environment was no longer supported. I do still see the .sencha/app/package*.properties files though, so it seems like it should work.

(FYI, I don't want to use Sencha's Cordova wrapper; I just want to build the project and import it into a Cordova project myself.)

sencha package build with cmd 5