Are `@Preview` annotated functions stripped from final binary?

# compose

[Gleno]

Are @Preview annotated functions stripped from final binary?

[Bryan Herbst]

No- @Preview functions can be used just the same as any other Composable. Simply having @Preview doesn’t guarantee that the composable is safe to be stripped.

[Gleno]

Hmm. Okay, I will look into stripping them some other way. They just hold so much junk. 🤪

[Bryan Herbst]

In most cases I would assume R8 would strip them if you have minification turned on (and this is an Android app)

[Gleno]

As unused leaves?

[Bryan Herbst]

Yeah- again, just my assumption. Since there are (probably) no references to them, they should be eligible for shrinking.

[Gleno]

Yeah, makes sense. But it’s strange to rely on R8 magic to strip out test code. Hmm, maybe that’s where @preview functions should go. #philosoraptor

[romainguy]

You can strip them using R8 (which is recommended for various optimizations that will get applied)

[Tonis Ives]

Ok thanks I will try

[Tonis Ives]

I wonder why Google doesn’t mention anything about R8 in the tutorial.

[Tonis Ives]

Maybe R8 is obvious for most of developers