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What are the plans around `FirAnalysisHandlerExtension` (<https://github.com/JetBrains/kotlin/blob/62700c3ec305417bd53dd7a89b26ac6a2b08714e/compiler/frontend.common.jvm/src/org/jetbrains/kotlin/fir/extensions/FirAnalysisHandlerExtension.kt|link>)? The appealing part of `AnalysisHandlerExtension` in K1 was that it was very easy to generate new Kotlin / Java source files, however it didn’t work well with incremental compilation. I see that Kapt4 uses the new extension to generate its files (I think that happens <https://github.com/JetBrains/kotlin/blob/62700c3ec305417bd53dd7a89b26ac6a2b08714e/plugins/kapt4/src/org/jetbrains/kotlin/kapt4/Kapt4AnalysisHandlerExtension.kt#L79-L82|here>). Is this the recommended approach to generate new files? Will there be hooks for incremental compilation? Does this support all targets or only the JVM?

The recommended approach for generation of new files is KSP

Kapt is implemented mostly for maintenance

KSP still comes with overhead and has restrictions such as that you can’t modify existing source code. Splitting logic of your tool between KSP and a compiler plugin isn’t great. I got really excited when I saw `FirAnalysisHandlerExtension` for that reason.

In this case you can generate new declarations with `FirDeclarationGenerationExtension`, which is part of main compiler plugin pipeline