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docs: fix the beforeAuthStateChanged import and the Imagen removal note (21.1.x) - #3821
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…te (angular#3817) The auth guide's cookie sync and the sample app imported beforeAuthStateChanged from firebase/auth, because AngularFire's version kept the app unstable until the first sign-in or sign-out (angular#3748). The fix (angular#3770) shipped in 20.1.1 and 21.0.0-rc.2, so both now import it from @angular/fire/auth, and the guide's note lists the releases that still need the workaround. The v21 upgrade guide covered only getImagenModel. firebase 12.18 removed every Imagen export, and the migration warns about getImagenModel only in files that imported an old Vertex AI entry point. Fixes angular#3815 Fixes angular#3816 (cherry picked from commit 503ce83)
armando-navarro
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bump: patch
tyler-reitz
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Oct 27, 2026
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Refs #3815
Refs #3816
Cherry-pick of #3817 (
503ce83onmain) onto21.1.x, so these corrections ship in 21.1.0. It applies with no conflicts.