What is the `multiplatform-setup` and the `multiplatform-compose-setup` plugins? First time I’m seei...

# compose-desktop

[spierce7]

What is the multiplatform-setup and the multiplatform-compose-setup plugins? First time I’m seeing the multiplatform-setup plugin.

[Javier]

I didn't see them, can you share links?

[spierce7]

They are used in the todoapp in all the common modules. My assumption is that they are cheaper options for libraries, but I’m having trouble resolving them locally. Currently investigating.

https://github.com/JetBrains/compose-jb/blob/master/examples/todoapp/common/root/build.gradle.kts#L2-L3

[Javier]

They are precompiled plugins

https://github.com/JetBrains/compose-jb/blob/master/examples/todoapp/buildSrc/src/main/kotlin/multiplatform-compose-setup.gradle.kts

[spierce7]

yes - I just found them in the buildSrc.

[spierce7]

it seems like it’s basically just a simple way for them to share buildscript configuration. Never seen it done quite like this. I like it.

[Javier]

Yep, if you have a lot of modules, they are very useful. Or if you have a lot of code in one gradle file, you can extract some configuration to precompiled plugins. For example I have precompiled plugins for Detekt and DependencyUpdates so I can apply them in the root file so:

plugins {
    Detekt
    DependencyUpdates
}

[Arkadii Ivanov]

I found this approach by accident and the Todo sample is the first time I used precompiled scripts. Also liked it. Here is the article which I bumped into when I was writing this sample: https://proandroiddev.com/sharing-build-logic-with-kotlin-dsl-203274f73013

[spierce7]

So I was confused why I couldn’t find the buildscript for the todo app. It appears the buildscript is inside the build.gradle.kts file for the buildSrc.

I’ve never seen this before. I’m also not understanding what these lines do: https://github.com/JetBrains/compose-jb/blob/master/examples/todoapp/buildSrc/build.gradle.kts#L37-L40

[Javier]

If you define the plugins inside dependencies block in buildSrc, you don't need to explicit the version when you use them later

[spierce7]

didn’t know that. I’ll try it out.

Do you know what this line is doing?

sourceSets.getByName("main").kotlin.srcDir("buildSrc/src/main/kotlin")

[Javier]

Check the comment above it

[Javier]

You can see there is a buildSrc inside buildSrc

[Javier]

without that approach, you cant access to Deps.kt object inside

[spierce7]

You can see there is a buildSrc inside buildSrc

Missed that! So there is!

[Javier]

I would like to know what is this:

kotlin-dsl-precompiled-script-plugins

[Javier]

@Arkadii Ivanov do you know about that plugin?

[spierce7]

that line makes sense now. It’s sharing the sources for the nested buildSrc with the root buildSrc.

[Arkadii Ivanov]

@Javier I found this in the above article, thought it is required for precompiled scripts.

[spierce7]

is the buildSrc inside of buildSrc really necessary?

[Javier]

I didn't need it for precompiled plugins but I had problems to creating extension functions for KotlinSourceSet for example, and I was wondering if this plugin could solve it 🤔

[Javier]

Yes if you want to use Deps or Versions inside buildSrc

[spierce7]

Ah, you mean the buildSrc build.gradle file. That makes sense

[Javier]

but I use it in different way to keep all the logic inside the first buildSrc so you don't have to enter never inside the second buildSrc

[Arkadii Ivanov]

I'm not 100% sure why this plugin is needed. I could check later if we can remove it. Currently I remember there some issues without it.

[spierce7]

I too have struggled to add extension functions to KotlinSourceSet

[Javier]

root/buildSrc

[Javier]

root/buildSrc/buildSrc

[Javier]

root/buildSrc/buildSrc/build.gradle.kts

[Javier]

You can add there Dependencies too

[Javier]

@Arkadii Ivanov if you find problems, please share them here 😄

[Arkadii Ivanov]

Will do

[Javier]

@spierce7 if you find a way to solve the problem where kotlin is an unresolved reference ping me too please

[spierce7]

I tried months ago to be able to add a list to implementation dependencies

[spierce7]

multiplatform plugin doesn’t allow a list of dependencies, while others do. I’ve given up on messing with that

[Javier]

My problem was this https://kotlinlang.slack.com/archives/C19FD9681/p1604786029273500

[Arkadii Ivanov]

@JavierLooks like the article I derived this code is a bit outdated. I think kotlin-dsl plugin now implicitly applies kotlin-dsl-precompiled-script-plugins plugin.

[Arkadii Ivanov]

The latter can be removed now.

[Javier]

Thank you 🙂