feat: include phoneNumber from PhoneMultiFactorInfo

this is useful for indicating to users which phone number they have
enrolled, and distinguishing between factors if there are multiple
phone factors enrolled.

Author: mnahkies

packages/auth/android/src/main/java/io/invertase/firebase/auth/ReactNativeFirebaseAuthModule.java

@@ -2507,6 +2507,10 @@ private WritableMap multiFactorInfoToMap(MultiFactorInfo hint) {
     hintMap.putString("factorId", hint.getFactorId());
     hintMap.putString("uid", hint.getUid());
 
+    if (hint.getFactorId().equals(PhoneMultiFactorGenerator.FACTOR_ID)) {
+      hintMap.putString("phoneNumber", ((PhoneMultiFactorInfo) hint).getPhoneNumber());
+    }
+
     return hintMap;
   }
 

packages/auth/e2e/multiFactor.e2e.js

@@ -562,6 +562,9 @@ describe('multi-factor modular', function () {
           multiFactorResolver.should.be.an.Object();
           multiFactorResolver.hints.should.be.an.Array();
           multiFactorResolver.hints.length.should.equal(1);
+          multiFactorResolver.hints[0].factorId.should.equal('phone');
+          multiFactorResolver.hints[0].phoneNumber.should.equal(phoneNumber);
+
           multiFactorResolver.session.should.be.a.String();
 
           const verificationId = await new firebase.auth.PhoneAuthProvider(

packages/auth/ios/RNFBAuth/RNFBAuthModule.m

@@ -1695,6 +1695,8 @@ - (NSDictionary *)firebaseUserToDict:(FIRUser *)user {
       @"enrollmentTime" : enrollmentTime,
       // @deprecated enrollmentDate kept for backwards compatibility, please use enrollmentTime
       @"enrollmentDate" : enrollmentTime,
+      // phoneNumber only present on FIRPhoneMultiFactorInfo
+      @"phoneNumber" : hint.phoneNumber == nil ? [NSNull null] : hint.phoneNumber,
     }];
   }
   return enrolledFactors;

packages/auth/lib/index.d.ts

@@ -472,7 +472,21 @@ export namespace FirebaseAuthTypes {
   /**
    * Contains information about a second factor.
    */
-  export interface MultiFactorInfo {
+  export type MultiFactorInfo = PhoneMultiFactorInfo | TotpMultiFactorInfo;
+
+  export interface PhoneMultiFactorInfo extends MultiFactorInfoCommon {
+    factorId: 'phone';
+    /**
+     * The phone number used for this factor.
+     */
+    phoneNumber: string;
+  }
+
+  export interface TotpMultiFactorInfo extends MultiFactorInfoCommon {
+    factorId: 'totp';
+  }
+
+  export interface MultiFactorInfoCommon {
     /**
      * User friendly name for this factor.
      */
@@ -481,10 +495,6 @@ export namespace FirebaseAuthTypes {
      * Time the second factor was enrolled, in UTC.
      */
     enrollmentTime: string;
-    /**
-     * Type of factor.
-     */
-    factorId: FactorId;
     /**
      * Unique id for this factor.
      */