Auth.kt

fun forgetPassword(email: String, isSuccess: (Boolean, message: String) -> Unit) {
    Firebase.auth.sendPasswordResetEmail(email)
        .addOnCompleteListener {
            if (it.isSuccessful) isSuccess(true, "Berhasil Dikirim")
                else isSuccess(false, DataHelpers.errorLoginMessage[it.exception?.message] ?: "")
        }
}

Chat.kt

fun getGroupingChat(uid: String, onResult: (List<GroupChat>) -> Unit) {
    Firestore.instance.collection(COLLECTION.CHAT_GROUP)
        .whereEqualTo("to", uid)
        .orderBy("time", Query.Direction.DESCENDING)
        .addSnapshotListener { value, error ->
            if (error != null) Log.d(TAG, "getGroupingChat:error = ${error.message}")
            
            if (value != null && !value.isEmpty) {
              onResult(value.toObjects(GroupChat::class.java))
            } else {
              onResult(listOf())
              Log.d(TAG, "getGroupingChat:failed = ${error?.message}")
            }
    }
}