Firebase Cloud Functions Params Validation and Error Handling (Node.js)

const functions = require('firebase-functions');const admin = require('firebase-admin');const app = !admin.apps.length ? admin.initializeApp() : admin.app();const db = admin.firestore();exports.deleteBot = functions.https.onCall(async (data, context) => {  const uid = context.auth.uid  if (!context.auth) {    throw new functions.https.HttpsError("unauthenticated", "Request had invalid credentials.")    // throw new functions.https.HttpsError('failed-precondition', 'Credentials are missing')  }  const botId = data.botId  if (!botId) {    throw new functions.https.HttpsError('invalid-argument', 'Missing botId');  }  const userRef = db.collection('user').doc(uid)  const botRef = userRef.collection('bot').doc(botId)  const batch = db.batch()  batch.delete(botRef)    const botMetaRef = userRef.collection('bot_meta').doc(botId)  batch.delete(botMetaRef)    await batch.commit();  return {    uid: uid,    botId: data.botId,    status: 'ok'  }});