Gradle 5.2+ required -> incremental APT and idea integration without apt plugin

immutables.apt.gradle.kts

plugins {
    idea
    `java-library`
}

group = "de.sergejisbrecht"
version = "1.0-SNAPSHOT"

repositories {
    mavenCentral()
}

configure<JavaPluginConvention> {
    sourceCompatibility = JavaVersion.VERSION_1_8
}

dependencies {
    annotationProcessor("org.immutables:value-processor:2.7.4")
    api("org.immutables:value-annotations:2.7.4")

    implementation("io.reactivex.rxjava2:rxjava:2.2.5")
    implementation("com.google.guava:guava:27.1-jre")
    implementation("io.vavr:vavr:1.0.0-alpha-2")


    testImplementation("org.assertj:assertj-core:3.11.1")
    testImplementation("org.junit.jupiter:junit-jupiter-api:5.3.1")
    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.3.1")
}

tasks.withType<Test> {
    useJUnitPlatform()
}

tasks {
    compileJava {
        options.compilerArgs.add("-Aimmutables.gradle.incremental")
    }
}