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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&lt;ItemSelection&gt;,
) {
    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`.

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 <https://kotlinlang.org/docs/ksp-quickstart.html#make-ide-aware-of-generated-code|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")
   }
}```

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.

Ok, that worked! Thanks so much for your help! :pray:

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&amp;cid=C013BA8EQSE>
So it looks like for now there is no way to have proper IDE support for optics on Android...