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The Firebase Kotlin SDK is a Kotlin-first SDK for Firebase. It's API is similar to the Firebase Android SDK Kotlin Extensions but also supports multiplatform projects, enabling you to use Firebase directly from your common source targeting iOS, Android or JS.

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package dev.gitlive.firebase.database

import dev.gitlive.firebase.FirebaseDecoder
import dev.gitlive.firebase.FirebaseEncoder
import dev.gitlive.firebase.SpecialValueSerializer
import kotlinx.serialization.KSerializer
import kotlinx.serialization.Serializable
import kotlinx.serialization.SerializationException

/** Represents a Firebase ServerValue. */
@Serializable(with = ServerValueSerializer::class)
expect class ServerValue internal constructor(nativeValue: Any){
    internal val nativeValue: Any

    companion object {
        val TIMESTAMP: ServerValue
        fun increment(delta: Double): ServerValue
    }
}

/** Serializer for [ServerValue]. Must be used with [FirebaseEncoder]/[FirebaseDecoder].*/
object ServerValueSerializer: KSerializer by SpecialValueSerializer(
    serialName = "ServerValue",
    toNativeValue = ServerValue::nativeValue,
    fromNativeValue = { raw ->
        raw?.let(::ServerValue) ?: throw SerializationException("Cannot deserialize $raw")
    }
)