TypeError: admin.auth(...).getUserByPhoneNumber is not a function

[cappittall]

Here the code at index.js (briefly)

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
const dB = admin.database();

`exports.contactAdded = functions.database.ref('/cards/{userPhoneEmail}/cont')
.onWrite(event =>{
 var telMail = (event.data._path).split('/')[2];
 if (!telMail.includes('@')) {
      admin.auth().getUserByPhoneNumber(telMail)
     .then(function(userRecord) {
     console.log("Successfully fetched user data:", userRecord.toJSON());
     findOutMyContacts(userRecord);
  })
 .catch(function(error) {
    console.log("Error fetching user data:", error);
 });
 } 
return  console.log(event.data._path, event.data._delta, event.data._newData);
});`

Function is triggered but this : admin.auth().getUserByPhoneNumber(telMail) gives an error :

TypeError: admin.auth(...).getUserByPhoneNumber is not a function
at exports.contactAdded.functions.database.ref.onWrite.event (/user_code/index.js:234:22)
at /user_code/node_modules/firebase-functions/lib/cloud-functions.js:35:20
at process._tickDomainCallback (internal/process/next_tick.js:135:7)

[laurenzlong]

Please file this as a bug on firebase-admin: https://github.com/firebase/firebase-admin-node