I have written the trigger below and I'm not sure what I should return in case a catch block is called. I know that Firebase docs say that triggers should always return a Promise...

exports.sendPushNotificationForNewMessage = functions.firestore.document("messages/{messageId}").onCreate(async (snap, context) => {
      const message = snap.data()
      const chatRoomId = message.chatRoomId
      const senderId = message.user.id
      const senderUsername = message.user.username

      try {
        const chatRoom = await admin.firestore().collection("chatRooms").doc(chatRoomId).get()
        const receiverId = chatRoom.data().userIds.find(userId => userId != senderId)

        const receiver = await admin.firestore().collection("users").doc(receiverId).get()
        const deviceToken = receiver.data().deviceToken

        if (deviceToken) {
          const payload = {
            notification: {
              title: "popster",
              body: `New DM from ${senderUsername}