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kotlinlang

Is there any experimental FIR plugin API that I can try out?

It exists, but it's in phase of active development
You can play with it if you want, but I don't recommend to use our for something serious right now

Some documentation: <https://github.com/JetBrains/kotlin/tree/master/docs/fir|https://github.com/JetBrains/kotlin/tree/master/docs/fir>

Template of plugin project with tests: <https://github.com/demiurg906/kotlin-compiler-course-examples/tree/compiler-plugin-project-setup|https://github.com/demiurg906/kotlin-compiler-course-examples/tree/compiler-plugin-project-setup>

Thank you! Not planning anything serious. Just want to check out its current capabilities.

Please send me any feedback you'll have (positive and negative). Right now API in state of polishing, which is based on feedback from real users