Unresolved reference for synthetic view when layout is in library module

Question

using Kotlin 1.20.20 (not that it matters, older versions behaves the same)

When layout is in separate library module Android Studio has no problem finding and refer

Answer 1

The solution is far simpler than imagined, Kotlin synthetic sugars are a part of Kotlin Android Extensions and you just have to apply the plugin manually (Android Studio applies this automatically only to application modules):

Add the following to your library / feature module's build Gradle:

apply plugin: 'kotlin-android-extensions'

Now enjoy Kotlin synthetic sugars in your Kotlin code! ;)