I’m planning on starting a project soon that will require server, desktop, cli, and maybe mobile or web, and I’d like to make it entirely in Kotlin Multiplatform. The current plan is to make a monorepo, but I’m wondering if it would be better to set it up as separate projects inside of a folder or use several modules in one project, with a module for shared code, and a module for each platform. My primary concern is that I’ll need to be able to deploy each platform (desktop, server, mobile) separately once I get that far. What is the suggested setup for something like this?

I'd vote for single git repo + multiple gradle modules

I was leaning towards modules. How is deployment when doing this? Does config get annoying?

It depends your workflow but I wouldn't expect anything to be too complicated

Since I'll be using Compose for UI, which requires a specific kotlin version, is there a good way to use newest kotlin for server/cli and a different version for desktop/mobile?

Ouch, I know nothing about that but that does sound like it could complicate things....

I can look into it. It’s not a dealbreaker if the Kotlin version has to be the same for the platforms.

it is possible to use different kotlin versions in different included builds, and compose a larger build out of that

So composite builds instead of multiple modules?

personally, I'd split into as few composite builds as possible, because there are still some annoyances across them (e.g.

./gradlew test

runs all tasks named

test

in the build, but not included builds)

Yea, running tests from included builds from IDEA is also another thing that isn't super reliable

if you can get away with a single kotlin version for all your modules, all the better. but if not, it is possible to work around

I'm talking in the UI + debugging

oh I never bother with the UI :)

I like clicking the green triangle and setting breakpoints with my mouse 🙂

IIRC if you tell IntelliJ to debug a Gradle task explicitly, it does work and you can set breakpoints

I filed this some time ago: https://youtrack.jetbrains.com/issue/KTIJ-19979