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kotlinarrow-kt

ArrowKT - @optics annotation not generating code

How do you setup the Arrow dependencies for @optics annotation to actually work? No companion objects are generated for the data classes annotated with @optics.

If I'm not mistaken, this is an annotation processor, so it should be imported using kapt, however the documentation uses it as compile.

Solution

  • For arrow 0.10.0

    apply plugin: 'kotlin-kapt'

def arrow_version = "0.10.1-SNAPSHOT"
dependencies {
    implementation "io.arrow-kt:arrow-optics:$arrow_version"
    implementation "io.arrow-kt:arrow-syntax:$arrow_version"
    kapt    "io.arrow-kt:arrow-meta:$arrow_version" // <-- this is the kapt plugin
}

    then:

    @optics data class Street(val number: Int, val name: String) {
    companion object {} // <-- this is required
}