sbt

abstract class BaseTestTask extends sbt.testing.Task
type SendSummary = ZIO[Summary, Nothing, Unit]
final class ZMasterTestRunner extends ZTestRunner
final class ZSlaveTestRunner extends ZTestRunner
final case class ZTestEvent(fullyQualifiedName: String, selector: Selector, status: Status, maybeThrowable: Option[Throwable], duration: Long, fingerprint: Fingerprint) extends Event with Product with Serializable
final class ZTestFramework extends Framework
sealed abstract class ZTestRunner extends Runner
final class ZTestTask extends BaseTestTask

object RunnableSpecFingerprint extends SubclassFingerprint
object SendSummary extends Serializable
object SummaryProtocol

The ScalaJS SBT Runner uses strings to send and receive summaries.
The ScalaJS SBT Runner uses strings to send and receive summaries. To transmit structured Summary data, we need to serialize to and from strings.
object ZTestEvent extends Serializable