Sourced from firebase-admin's releases.

Firebase Admin Node.js SDK v5.11.0

Firebase Auth

• A new auth.importUsers() method for importing users to Firebase Auth in bulk.

Firebase Admin Node.js SDK v5.10.0

• Upgraded Realtime Database client to v0.2.0. With this upgrade developers can call the admin.database().ref() method with another Reference instance as the argument.
• Upgraded Cloud Firestore client to v0.13.0.

Firebase Admin Node.js SDK v5.9.1

• The admin.initializeApp() method can now be invoked without a credential option. This prompts the SDK to use Google Application Default Credentials.
• Upgraded the Cloud Firestore client from 0.11.1 to 0.12.0.
• Upgraded the Cloud Storage client from 1.2.1 to 1.6.0.
• Upgraded the Firebase Database client from 0.1.3 to 0.1.11.

Firebase Admin Node.js SDK v5.9.0

Firebase Cloud Messaging

• A new messaging.send() method for sending messaging messages.

Firebase Admin Node.js SDK v5.8.2

• [changed] Exposed admin.firestore.DocumentReference and admin.firestore.DocumentSnapshot types from the Admin SDK typings.
• [changed] Upgraded Firestore dependency version to 0.11.2.

Firebase Admin Node.js SDK v5.8.1

• This release upgrades the Cloud Firestore dependency version from 0.10.0 to 0.11.1, which includes several bug fixes in Cloud Firestore.

Firebase Admin Node.js SDK v5.8.0

Initialization

• The admin.initializeApp() method can now be invoked without any arguments. This will initialize an app using Google Application Default Credentials, and other AppOptions loaded from the FIREBASE_CONFIG environment variable.

Authentication

• Upgraded the jsonwebtoken library to 8.1.0.

Firebase Admin Node.js SDK v5.7.0

Authentication

• A new revokeRefreshTokens() method for revoking refresh tokens issued to a user.
• The verifyIdToken() method now accepts an optional checkRevoked argument, which can be used to check if a given ID token has been revoked.

Firebase Admin Node.js SDK v5.6.0

• A new admin.instanceId() API that facilitates deleting instance IDs and associated user data from Firebase projects.
• Updated the TypeScript typings for admin.AppOptions to reflect the introduction of the projectId option.
• Removed some unused third party dependencies.
• Updated [**google**](https://github.com/google)-cloud/firestore dependency to latest.

Sourced from firebase-admin's changelog.

v5.11.0

• [changed] Added the auth.importUsers() method for importing users to
  Firebase Auth in bulk.

v5.10.0

• [changed] Upgraded Realtime Database client to v0.2.0. With this upgrade
  developers can call the admin.database().ref() method with another
  Reference instance as the argument.
• [changed] Upgraded Cloud Firestire client to v0.13.0.

v5.9.1

• [changed] The admin.initializeApp() method can now be invoked without an
  explicit credential option. In that case the SDK will get initialized with
  Google application default credentials.
• [changed] Upgraded Realtime Database client to v0.1.11.
• [changed] Modified the Realtime Database client integration to report the
  correct user agent header.
• [changed] Upgraded Cloud Firestire client to v0.12.0.
• [changed] Improved error handling in FCM by mapping more server-side errors
  to client-side error codes.

v5.9.0

• [added] Added the messaging.send() method and the new Message type for
  sending Cloud Messaging notifications via the
  new FCM REST endpoint.

v5.8.2

• [changed] Exposed admin.firestore.DocumentReference and
  admin.firestore.DocumentSnapshot types from the Admin SDK typings.
• [changed] Upgraded Firestore dependency version to
  0.11.2.

v5.8.1

• [changed] Upgraded Firestore dependency version from 0.10.0 to 0.11.1.
  This includes several bug fixes in Cloud Firestore.

v5.8.0

Initialization

• [added] The admin.initializeApp()
  method can now be invoked without any arguments. This initializes an app
  using Google Application Default Credentials, and other
  AppOptions loaded from
  ... (truncated)

• 8d3925a Bumped version to 5.11.0 (#232)
• d2484a8 Updated Changelog (#231)
• 83309bb feat(auth): Adds support for importUsers API. (#220)
• 6c1dfb0 Bumped version to 5.10.0 (#227)
• 478f7f7 Upgrading Database Client (ref-from-ref) (#226)
• 18a133e Bumped version to 5.9.1 (#219)
• 069c9cd Handling FCM Canonical Errors (#218)
• ec08be2 Upgraded Firestore Client to 0.12.0 (#216)
• 76ca6d6 Using ADC when no credentials are specified in options (#214)
• e87b47c Passing Admin SDK version to RTDB client (#212)
• Additional commits viewable in compare view