example circe generic extra configured json codec adt

_output.txt

{
  "street" : "street",
  "streetNumber" : 3,
  "zip" : 3,
  "kind" : "HomeAddress"
}
{
  "street" : "pickupstreet",
  "streetNumber" : 3,
  "zip" : 3,
  "kind" : "PickupStation"
}
{
  "mail" : "a@b.de",
  "kind" : "Mail"
}
Right(PickupStation(pickupstreet,3,3))

Main.scala

package org.felher.tmpNvkhHSWXMk

import io.circe.syntax._
import io.circe.parser._
import io.circe._
import io.circe.generic.extras._
import cats.implicits._

object Main {
  def main(args: Array[String]): Unit = {
    
    //Encoder is not contra-variant.
    implicit def narrow[A <: ContactInformation](implicit enc: Encoder[ContactInformation]): Encoder[A] = enc.narrow[A]

    println(HomeAddress("street", 3, 3).asJson);
    println(PickupStation("pickupstreet", 3, 3).asJson);
    println(Mail("a@b.de").asJson);
    println(decode[ContactInformation](PickupStation("pickupstreet", 3, 3).asJson.spaces2))
  }
}

@ConfiguredJsonCodec()
sealed trait ContactInformation
sealed trait Postal extends ContactInformation
final case class HomeAddress(street: String, streetNumber: Int, zip: Int) extends Postal
final case class PickupStation(street: String, streetNumber: Int, zip: Int) extends Postal
final case class Mail(mail: String) extends ContactInformation

package.scala

package org.felher;

import io.circe.generic.extras.Configuration
package object tmpNvkhHSWXMk {
  implicit val customConfig: Configuration = Configuration.default.withDiscriminator("kind")
}