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The v21 upgrade guide says only `getImagenModel` was removed from the AI API

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已经有一个关联 PR 被合并了。

  • #3817 来自 @armando-navarro —— 已合并

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技术栈
firebase, typescript
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documentation

调研方向

Read docs/version-21-upgrade.md, especially its “Removed symbols” section, and check the listed Imagen* exports against the issue. Update the guide to explain that all 12 exports were removed and that the ng update migration may not flag them for imports from the AI entry points. Done when the guide covers both omissions; linked pull request #3817 is already open.

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描述

comp: ai comp: docs type: chore version: current (v17+)

The "Removed symbols" section of docs/version-21-upgrade.md covers getImagenModel. But firebase 12.18 (@firebase/ai 2.15.0) removed all 12 Imagen* exports:

  • getImagenModel
  • ImagenAspectRatio, ImagenGCSImage, ImagenGenerationConfig, ImagenGenerationResponse, ImagenImageFormat, ImagenInlineImage
  • ImagenModel, ImagenModelParams, ImagenPersonFilterLevel, ImagenSafetyFilterLevel, ImagenSafetySettings

AngularFire 21 requires firebase ^12.18.0, so every app that upgrades loses them.

The ng update migration does not warn about the other 11. It also warns about getImagenModel only in files that import an old Vertex AI entry point (@angular/fire/vertexai, firebase/vertexai, or their -preview variants). An app that already imports from @angular/fire/ai or firebase/ai gets compile errors that the migration does not explain.

The guide already notes that Firebase shut the Imagen models down, so these apps were already failing at runtime. The guide should say that every Imagen* export is gone, and that the migration does not flag them.

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