I added to my build.gradle.kts: ```plugins { id("com.google.devtools.ksp") } dependencies { ...

# arrow

[Lukasz Kalnik]

I added to my build.gradle.kts:

plugins {
    id("com.google.devtools.ksp")
}

dependencies {
    implementation("io.arrow-kt:arrow-optics:$arrowVersion")
    ksp("io.arrow-kt:arrow-optics-ksp-plugin:$arrowVersion")
}

I have also annotated my data classes:

@optics
data class ConnectorWithSensors(
    val connector: Connector,
    val sensors: List<ItemSelection>,
) {
    companion object
}

@optics
data class ItemSelection(
    val id: String,
    val selected: Boolean,
) : {
    companion object
}

However I cannot access the extensions generated on companion object like ConnectorWithSensors.sensors.

[Lukasz Kalnik]

KSP version 1.6.10-1.0.2

[Lukasz Kalnik]

Arrow version 1.1.2

[Lukasz Kalnik]

message has been deleted

[Alejandro Serrano Mena]

my suggestion would be to check:
1. does ./gradlew build work? if so, the KSP plugin is working
2. if the problem is only in the IDE, this means you need to add the generated sources as explained here. My suggestion is to add the following then to your gradle file

plugins {
   // ...
   idea
}

idea {
   module {
      // Not using += due to <https://github.com/gradle/gradle/issues/8749>
      sourceDirs = sourceDirs + file("build/generated/ksp/main/kotlin") // or tasks["kspKotlin"].destination
      testSourceDirs = testSourceDirs + file("build/generated/ksp/test/kotlin")
      generatedSourceDirs = generatedSourceDirs + file("build/generated/ksp/main/kotlin") + file("build/generated/ksp/test/kotlin")
   }
}

[Lukasz Kalnik]

So one problem was (which I didn't mention) that my data classes were internal.
So ksp complained that "public member exposes internal type" in the generated code.
After making the data classes public the project builds, however the extension property ConnectorWithSensors.sensors is still red. I will try to import the generated sources as you suggested.

[Lukasz Kalnik]

Ok, that worked! Thanks so much for your help! 🙏

[Lukasz Kalnik]

message has been deleted

[Lukasz Kalnik]

On the other hand, it looks like importing the generated sources in a project with build variants doesn't work correctly (it breaks the cache):
https://kotlinlang.slack.com/archives/C013BA8EQSE/p1657364970659239?thread_ts=1657364826.656609&cid=C013BA8EQSE
So it looks like for now there is no way to have proper IDE support for optics on Android...