Firestore and Realtime Database administration and grants about react-most-wanted HOT 4 CLOSED

import { database } from 'firebase-functions'
import admin from 'firebase-admin'

exports = module.exports = database
    .ref('/admins/{userUid}')
    .onWrite((change, context) => {
        const userUid = context.params.userUid
        if(change.before.exists()){
            if(!change.after.exists())
                return admin.firestore().collection('admins').doc(userUid).delete();
        } else if(change.after.exists())
            return admin.firestore().collection('admins').doc(userUid).set({});
        return null;
    })                     

import { database } from 'firebase-functions'
import admin from 'firebase-admin'

exports = module.exports = database
  .ref('/user_grants/{userUid}/{grantName}')
    .onWrite((eventSnapshot, context) => {
        const userUid = context.params.userUid
        const grantName = context.params.grantName
        let prm = {}
        if (eventSnapshot.after.val()) {
            prm[grantName] = true;
        } else {
            prm[grantName] = false;
        }
        return admin.firestore().collection('user_grants').doc(userUid).set(prm, {merge:true});
  })