K2 compiler compatibility

[zakhenry]

Announced today - https://blog.jetbrains.com/idea/2024/03/k2-kotlin-mode-alpha-in-intellij-idea/ the K2 compiler is available in Intellij 2024.1 RC, but kotest plugin fails to install:

Plugin is incompatible with the Kotlin plugin in K2 mode

[bukajsytlos]

https://slack-chats.kotlinlang.org/t/16947255/what-is-required-of-plugin-authors-to-support-k2-mode-for-in#cdbf8020-797e-4e62-a1cc-660f8aa0d168

[mrclrchtr]

We would also like to switch to K2. Is there a goal to make the plugin compatible in the near future?

[sksamuel]

For the v6 release of kotest, kotlin 2.0 (and therefore k2) will be the default.

[Kantis]

Note that you can still use K2 for your project. You just can't use it for the IDE at the moment.

We're still waiting for information from JetBrains on how to enable our plugin with K2 IDE mode

[zetbrush]

Hey there, @Kantis is there any update/ETA on when the plugin issue will be fixed?

[cloudshiftchris]

IntelliJ 2024.2 landed today, with K2 mode in Beta. Lack of kotest plugin support is a blocker for enabling K2 in the IDE.

[sksamuel]

It's in progress. I am waiting on a reply from Jetbrains what exactly needs to be done, as currently there are no docs in place on how to upgrade plugins that don't work. It just says "isn't compatible" :)

[cloudshiftchris]

Understood, thanks for the update. Sounds frustrating.

[OliverO2]

I have never looked into IJ plugins, but do we have something like with K2 compiler plugins (in derivatives of CompilerPluginRegistrar)?

   override val supportsK2 = true

[cloudshiftchris]

From what I've been able to discern any plugin that has a dependency on the IJ Kotlin plugin is automatically marked as incompatible, except those on a magic "safe list". atm no evident way to make/mark your plugin as compatible (this is what JB needs to provide - docs/guides on how to make it compatible, and a mechanism to allow compatible plugins that isn't a hard-coded safe list).

reference:
https://intellij-support.jetbrains.com/hc/en-us/community/posts/20630080086034

[cloudshiftchris]

Feedback from JB:

Hey! We’ve published a guide on migration from K1 to K2: https://kotlin.github.io/analysis-api/migrating-from-k1.html
The guide has a section on declaring that a plugin supports K2: https://kotlin.github.io/analysis-api/migrating-from-k1.html#declaring-compatibility-with-the-k2-kotlin-mode
The setting will only be available starting from IntelliJ 2024.2.1 (Preview), which hasn’t been released yet AFAIK, but will be soon.
By the way, the website I linked is a general guide for the Analysis API, which is the new analysis engine for K2 (and also has a K1 mode for backwards compatibility). Beyond the K1 to K2 migration guide, there’s a lot of information in the other sections of the guide which should help with migrating a plugin to the Analysis API.

[Kantis]

@cloudshiftchris where did you find that info? I would like to check any following discussion etc.