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GeezerVison is showing github.com — fix(ai): drop the getImagenModel wrapper, removed in firebase 12.18 by armando-navarro · Pull Request #3750 · angular/angularfire

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armando-navarro commented Aug 21, 2026

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Issue number for this PR: @angular/fire/ai fails to build against firebase 12.18, which removed getImagenModel #3749
Docs included?: yes, the upgrade guide and docs/ai.md
Test units included?: yes, a migration spec for the new removed-symbol guidance (227 specs, 0 failures)
In a clean directory, yarn install, yarn test run successfully?: yes

Description

Fixes #3749.

Firebase shut the Imagen models down in August 2026 and removed the Imagen API in @firebase/ai 2.15.0, which ships in firebase 12.18.0. The ai entry point imports getImagenModel, so any app whose install resolves firebase 12.18.0 fails to build.

The fix

The generator excludes getImagenModel from the wrapped named imports (a null override in tools/build.ts).
Installs whose firebase still includes the symbol (12.17 and older) keep compiling, because the entry point re-exports everything from firebase/ai with export *. That is compile-time grace only: the models are shut down, so the calls fail at the service on any firebase version.
The package deliberately keeps building against firebase 12.4.0, the lowest version the published ^12.4.0 range allows. That way every symbol the generated file imports by name exists in every firebase version a user's install can resolve.

Verification

A sweep of every wrapped @firebase package between the 12.4.0-mapped and 12.18.0-mapped versions confirmed getImagenModel is the only export removed in that window.
A typecheck of all generated named imports against a real firebase 12.18.0 install passes with this change and fails without it.
227 specs, 0 failures.

Also in this change

The ng update Vertex AI migration treats getImagenModel as a removed symbol, leaving the import in place and logging guidance to move image generation to the Gemini image models through getGenerativeModel, with a new spec covering it.
The upgrade guide documents the removal, and its migration section is restructured into labeled cases and subheadings.
docs/ai.md no longer advertises Imagen models.

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          fix(ai): drop the getImagenModel wrapper, removed in firebase 12.18

a7e74c4

Firebase shut the Imagen models down in August 2026 and @firebase/ai
2.15.0 (firebase 12.18.0) removed the API. Our ai entry point
named-imports getImagenModel, so any install resolving firebase
12.18.0, which ^12.4.0 does on every fresh install, fails to build.

The generator now excludes getImagenModel from the wrapped named
imports. Installs whose firebase still includes the symbol (12.17
and older) keep compiling, because the entry point re-exports
everything from firebase/ai with export *. That is compile-time
grace only: the models are shut down, so the calls fail at the
service on any firebase version. The package keeps building against
firebase 12.4.0, the lowest version the published ^12.4.0 range
allows, so every symbol the generated file imports by name exists in
every firebase version a user's install can resolve: a sweep of every
wrapped @firebase package between the 12.4.0- and 12.18.0-mapped
versions found getImagenModel to be the only removed export.

The ng update migration now warns on getImagenModel imports with
guidance to move image generation to the Gemini image models via
getGenerativeModel, with a spec. The upgrade guide documents the
removal and its migration section is restructured for readability.

armando-navarro requested a review from tyler-reitz

August 21, 2026 00:21

armando-navarro added bump: patch

Size of the change: a fix or docs change that reaches users

comp: ai

Firebase AI Logic / Vertex AI (src/ai).

comp: docs

Documentation.

comp: schematics

ng add / deploy schematics (src/schematics).

type: bug Defect: expected behavior doesn't happen. labels

Aug 21, 2026

tyler-reitz approved these changes

Aug 21, 2026

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Verified independently: the named imports of all 14 generated firebase.ts files typecheck against a real firebase 12.18.0 install, and re-adding getImagenModel reproduces the TS2305 from #3749; regenerating every entry point with this branch's tools/build.ts produces zero drift against the committed files; the new migration spec goes red with the tables.ts entry removed; and the published rc tarball keeps export * from 'firebase/ai' verbatim in the shipped .d.ts and fesm, so the fix carries through to the artifact users install.

One note, not a change request: on firebase 12.17 and older, getImagenModel is still reachable through the star export but now unwrapped, where the zone-wrapped named export used to shadow it (ran both shapes to confirm the precedence). Since every call fails at the shut-down service, the only effect is the rejection settling outside the Angular zone, consistent with the compile-time-grace framing in the description.

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armando-navarro merged commit b83343d into angular:main

Aug 21, 2026

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armando-navarro mentioned this pull request

Sep 1, 2026

build: require firebase ^12.18.0 and wrap the functions it adds #3761

Merged

armando-navarro added this to the 21.0.0-rc.1 milestone

Oct 1, 2026

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tyler-reitz

tyler-reitz approved these changes

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bump: patch

Size of the change: a fix or docs change that reaches users

comp: ai

Firebase AI Logic / Vertex AI (src/ai).

comp: docs

Documentation.

comp: schematics

ng add / deploy schematics (src/schematics).

type: bug

Defect: expected behavior doesn't happen.

Projects

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Milestone

21.0.0-rc.1

Development

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@angular/fire/ai fails to build against firebase 12.18, which removed getImagenModel

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