diff --git a/docgen/content-sources/node/toc.yaml b/docgen/content-sources/node/toc.yaml
index 4466e2559f..bba7cf4f64 100644
--- a/docgen/content-sources/node/toc.yaml
+++ b/docgen/content-sources/node/toc.yaml
@@ -86,6 +86,10 @@ toc:
     path: /docs/reference/admin/node/admin.auth.UserInfo
   - title: "UserMetadata"
     path: /docs/reference/admin/node/admin.auth.UserMetadata
+  - title: "UserMetadataRequest"
+    path: /docs/reference/admin/node/admin.auth.UserMetadataRequest
+  - title: "UserProviderRequest"
+    path: /docs/reference/admin/node/admin.auth.UserProviderRequest
   - title: "UserRecord"
     path: /docs/reference/admin/node/admin.auth.UserRecord
   - title: "SessionCookieOptions"
diff --git a/src/auth.d.ts b/src/auth.d.ts
index eedb08786b..cfc2c1fd9c 100644
--- a/src/auth.d.ts
+++ b/src/auth.d.ts
@@ -624,6 +624,58 @@ export namespace admin.auth {
     errors: _admin.FirebaseArrayIndexError[];
   }
 
+  /**
+   * User metadata to include when importing a user.
+   */
+  interface UserMetadataRequest {
+
+    /**
+     * The date the user last signed in, formatted as a UTC string.
+     */
+    lastSignInTime?: string;
+
+    /**
+     * The date the user was created, formatted as a UTC string.
+     */
+    creationTime?: string;
+  }
+
+  /**
+   * User provider data to include when importing a user.
+   */
+  interface UserProviderRequest {
+
+    /**
+     * The user identifier for the linked provider.
+     */
+    uid: string;
+
+    /**
+     * The display name for the linked provider.
+     */
+    displayName?: string;
+
+    /**
+     * The email for the linked provider.
+     */
+    email?: string;
+
+    /**
+     * The phone number for the linked provider.
+     */
+    phoneNumber?: string;
+
+    /**
+     * The photo URL for the linked provider.
+     */
+    photoURL?: string;
+
+    /**
+     * The linked provider ID (for example, "google.com" for the Google provider).
+     */
+    providerId: string;
+  }
+
   /**
    * Interface representing a user to import to Firebase Auth via the
    * {@link https://firebase.google.com/docs/reference/admin/node/admin.auth.Auth#importUsers `importUsers()`} method.
@@ -643,7 +695,7 @@ export namespace admin.auth {
     /**
      * Whether or not the user's primary email is verified.
      */
-    emailVerified: boolean;
+    emailVerified?: boolean;
 
     /**
      * The user's display name.
@@ -664,17 +716,17 @@ export namespace admin.auth {
      * Whether or not the user is disabled: `true` for disabled; `false` for
      * enabled.
      */
-    disabled: boolean;
+    disabled?: boolean;
 
     /**
      * Additional metadata about the user.
      */
-    metadata: admin.auth.UserMetadata;
+    metadata?: admin.auth.UserMetadataRequest;
 
     /**
      * An array of providers (for example, Google, Facebook) linked to the user.
      */
-    providerData?: admin.auth.UserInfo[];
+    providerData?: admin.auth.UserProviderRequest[];
 
     /**
      * The user's custom claims object if available, typically used to define
@@ -703,6 +755,11 @@ export namespace admin.auth {
      * to the tenant corresponding to that `TenantAwareAuth` instance's tenant ID.
      */
     tenantId?: string | null;
+
+    /**
+     * The user's multi-factor related properties.
+     */
+    multiFactor?: admin.auth.MultiFactorUpdateSettings;
   }
 
   /**
diff --git a/test/integration/auth.spec.ts b/test/integration/auth.spec.ts
index 209b24ec14..19f33b1d05 100755
--- a/test/integration/auth.spec.ts
+++ b/test/integration/auth.spec.ts
@@ -1421,7 +1421,7 @@ describe('admin.auth', () => {
 
   describe('importUsers()', () => {
     const randomUid = 'import_' + generateRandomString(20).toLowerCase();
-    let importUserRecord: any;
+    let importUserRecord: admin.auth.UserImportRecord;
     const rawPassword = 'password';
     const rawSalt = 'NaCl';
     // Simulate a user stored using SCRYPT being migrated to Firebase Auth via importUsers.
@@ -1635,15 +1635,15 @@ describe('admin.auth', () => {
           return admin.auth().getUser(uid);
         }).then((userRecord) => {
           // The phone number provider will be appended to the list of accounts.
-          importUserRecord.providerData.push({
-            uid: importUserRecord.phoneNumber,
+          importUserRecord.providerData?.push({
+            uid: importUserRecord.phoneNumber!,
             providerId: 'phone',
-            phoneNumber: importUserRecord.phoneNumber,
+            phoneNumber: importUserRecord.phoneNumber!,
           });
           const actualUserRecord: {[key: string]: any} = userRecord.toJSON();
           for (const key of Object.keys(importUserRecord)) {
             expect(JSON.stringify(actualUserRecord[key]))
-              .to.be.equal(JSON.stringify(importUserRecord[key]));
+              .to.be.equal(JSON.stringify((importUserRecord as any)[key]));
           }
         }).should.eventually.be.fulfilled;
     });
@@ -1652,6 +1652,23 @@ describe('admin.auth', () => {
       const uid = generateRandomString(20).toLowerCase();
       const email = uid + '@example.com';
       const now = new Date(1476235905000).toUTCString();
+      const enrolledFactors: admin.auth.UpdatePhoneMultiFactorInfoRequest[] = [
+        {
+          uid: 'mfaUid1',
+          phoneNumber: '+16505550001',
+          displayName: 'Work phone number',
+          factorId: 'phone',
+          enrollmentTime: now,
+        } ,
+        {
+          uid: 'mfaUid2',
+          phoneNumber: '+16505550002',
+          displayName: 'Personal phone number',
+          factorId: 'phone',
+          enrollmentTime: now,
+        },
+      ];
+
       importUserRecord = {
         uid,
         email,
@@ -1671,22 +1688,7 @@ describe('admin.auth', () => {
           },
         ],
         multiFactor: {
-          enrolledFactors: [
-            {
-              uid: 'mfaUid1',
-              phoneNumber: '+16505550001',
-              displayName: 'Work phone number',
-              factorId: 'phone',
-              enrollmentTime: now,
-            },
-            {
-              uid: 'mfaUid2',
-              phoneNumber: '+16505550002',
-              displayName: 'Personal phone number',
-              factorId: 'phone',
-              enrollmentTime: now,
-            },
-          ],
+          enrolledFactors,
         },
       };
       uids.push(importUserRecord.uid);
@@ -1702,7 +1704,7 @@ describe('admin.auth', () => {
           const actualUserRecord: {[key: string]: any} = userRecord.toJSON();
           expect(actualUserRecord.multiFactor.enrolledFactors.length).to.equal(2);
           expect(actualUserRecord.multiFactor.enrolledFactors)
-            .to.deep.equal(importUserRecord.multiFactor.enrolledFactors);
+            .to.deep.equal(importUserRecord.multiFactor?.enrolledFactors);
         }).should.eventually.be.fulfilled;
     });
 
@@ -1741,7 +1743,9 @@ describe('admin.auth', () => {
  * @retunr {Promise<void>} A promise that resolved on success.
  */
 function testImportAndSignInUser(
-  importUserRecord: any, importOptions: any, rawPassword: string): Promise<void> {
+  importUserRecord: admin.auth.UserImportRecord,
+  importOptions: any,
+  rawPassword: string): Promise<void> {
   const users = [importUserRecord];
   // Import the user record.
   return admin.auth().importUsers(users, importOptions)
@@ -1751,7 +1755,7 @@ function testImportAndSignInUser(
       expect(result.successCount).to.equal(1);
       expect(result.errors.length).to.equal(0);
       // Sign in with an email and password to the imported account.
-      return clientAuth().signInWithEmailAndPassword(users[0].email, rawPassword);
+      return clientAuth().signInWithEmailAndPassword(users[0].email!, rawPassword);
     })
     .then(({user}) => {
       // Confirm successful sign-in.