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Title
# gradle
a

Alexei Artsimovich

11/27/2023, 11:38 AM
Hello! Hope this is the right channel to ask. I have a question: does the internal keyword play role in compilation avoidance in Kotlin? There is a new approach to incremental compilation in Kotlin, which improved compilation avoidance for ABI-compatible changes. https://blog.jetbrains.com/kotlin/2022/07/a-new-approach-to-incremental-compilation-in-kotlin 1 I wonder if the
internal
keyword plays a role in this. Should classes and methods that are not intended to be used outside a module be marked with the internal visibility so that changes to their signature do not cause dependent modules to be recompiled?
j

Javier

11/27/2023, 11:46 AM
I would like to know about this as you can call internal declaration in other modules if you suppress the error. So I don’t know if internal can be used to avoid recompilations
e

ephemient

11/27/2023, 11:48 AM
internal
is also effectively
public
to any Java code, as well as
public inline
usages of
@PublishedApi internal
, so it does form part of the ABI
e

Evgenii Mazhukin

11/27/2023, 1:31 PM
Hello! For compilation avoidance purposes, Kotlin treats
internal
same way as
public
. As @Javier and @ephemient pointed out, there are ways to call other module's internal API. However, part of the compileKotlin task's job is to calculate which files should be recompiled. If it is an incremental build, and dependent module doesn't use the changed APIs, for JVM we would not actually recompile any files in that module. We're interested in improving compilation avoidance in that area, but there are no specific plans yet. Please vote on the issue if you feel that it strongly affects your projects: https://youtrack.jetbrains.com/issue/KT-63830/Compilation-avoidance-should-ignore-internal-changes-if-possible To summarize: no avoidance. Nonetheless, it's a good idea to mark an API
internal
, if it's intended to be internal. It would help your collaborators use proper APIs in their code. And, well, code is for people, compiler just makes it work.
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