Firebase

Recently shipped App Check CLI provider management, a two-phase non-interactive login, and a new round of standalone SEA binary fixes.

App Check gained CLI provider management. appcheck:providers:list/get/set configure attestation providers per app, and appcheck:apps:list shows every app with its providers. Experimental extdeprecationwarnings flags deprecated extensions ahead of the March 2027 decommission.

CLI login and MCP tooling got agent-friendly. firebase login --non-interactive now supports a two-phase flow with an authorization code, and the CLI auto-enables non-interactive mode when it detects an AI agent. MCP tools require a Firebase project by default, gained reauth and outputSchema support, and Crashlytics MCP tools now cover web apps.

Firestore emulator now runs DML — v15.25.0 upgraded to emulator v1.22.0 and fixed Storage emulator hangs on large JSON uploads and concurrent requests. The Dart functions fix now requires Dart SDK 3.13.0.

AI logic closes the Imagen chapter. JS SDK removed Imagen methods as models shut down; apps migrate to Gemini Image models ("Nano Banana"). The deprecated FirebaseMlModelDownloader API also got the axe on Apple platforms.

Standalone SEA binaries matured — previews 3 and 4 fixed shell parsing, npm lifecycle scripts, and CWD name collisions; Node 26 SEA previews ship as signed Universal 2 macOS binaries.

Also: crashlytics:onboard:web plus hidden source maps, --immediate on ext:uninstall, Data Connect emulator v3.4.18 refresh, and JSSDK firebase@12.17.1 aligns data-connect backoff parameters.