I’m a little bit confused with the `dependsOn` rel...

# multiplatform

[zalewski.se]

I’m a little bit confused with the dependsOn relation for the source sets. Let’s say I have structure like this:

sourceSets {
        val commonMain by getting {
            dependencies {
                implementation("org.jetbrains.kotlin:kotlin-stdlib")
                implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core-common:$coroutines_version")
        }

        val androidMain by getting {
            dependsOn(commonMain)

            dependencies {
                implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutines_version")
                implementation("com.android.support:support-compat:28.0.0")
            }
        }

In such scenario, androidMain will get from the commonMain everything, including the coroutines-core-common? (But I don’t think I need this as in androidMain I have coroutines-core) Isn’t it better to declare exact dependencies for every source set than use dependsOn?

[kevin]

That is a good question

[kevin]

I think modules dependsOn(commonMain) already happen automatically

[kevin]

In this talk they explain a bit more on how dependsOn work:

[kevin]

https://www.youtube.com/watch?v=oBv1QykLAXc▾

[kevin]

11:20

[Kris Wong]

dependsOn is useful for say, common code between 2 iOS targets, or common code between iOS and macOS tagrgets

[Kris Wong]

obviously your target specific source sets automatically depend on your common source sets

[Kris Wong]

dependencies block is for external dependencies. dependsOn is for internal sources

[zalewski.se]

@Kris Wong
Seems like a lot of magic is happening under the hood there lol
What exactly do you mean by internal sources?

[Kris Wong]

sources within your module

[kevin]

🤔 like Kotlin multimodules?

[kevin]

Something similar than

implementation project(':businesslogic')

?

[zalewski.se]

@Kris Wong

obviously your target specific source sets automatically depend on your common source sets

Does it work for Android tests too?

I have commonTests that looks like this

kotlin {
    val uniqueName = "${project.rootProject.name}${project.name.capitalize()}"

    android()
    ios {
        binaries {
            framework(uniqueName)
        }
    }

    sourceSets {

        val commonTest by getting {
            dependencies {
                implementation(kotlin("test-common"))
                implementation(kotlin("test-annotations-common"))
                implementation(Koin.test)
            }
        }
    }
}

And still above the kotlin block I have to put:

dependencies {
    testImplementation(kotlin("test", Build.Versions.kotlin))
    testImplementation(kotlin("test-junit", Build.Versions.kotlin))
    testImplementation(Koin.test)
}

[Kris Wong]

yes, it works for tests