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Why can't I import `com.android.tools.build:builder` artifact into my `buildSrc` to be able to configure AGP from kotlin code? Sources compile fine, but the code that references it is all red in IDE. Anyone faced simular issue?

you can do this, probably IDE issue, did you tried to invalidate project cache?

I did. AS 3.4, `com.android.builder.core.DefaultProductFlavor` still note accesable

Maybe you could try to share sample project

Just realized that you have strange dependency id.
You probably need
`com.android.tools.build:gradle` not `com.android.tools.build:builder`

You misunderstood. AGP is composed of multiple artifacts. The ones that expose mutable domain objects(like flavor, buildType, etc) ar in `com.android.tools.build:builder` jar. But IDE doesn't recognizes it

<https://issuetracker.google.com/issues/123032843>

There’s a problem with `buildSrc` in Android Studio, afaik it’s fixed in 3.5 Canary 12. It may be causing the issue.