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Preserve non-Firebase producer baselines before Firebase 13 cutover #257
Description
The Firebase 13 XBD experiment changes the shared native dependency projects to the Firebase 13 closure. Non-Firebase products retain their native pins and existing NuGet declarations, but their legacy Cake build traverses the same repository-owned projects. Removing the old mixed-build guard does not restore a compatible CocoaPods production closure: migrated shared PodSpecs are empty, and scoped projects intentionally require the verified Firebase producer before pack.
Affected producer paths include Google.SignIn and the deferred Cast/Tag Manager/ML Kit closures. This does not require changing or republishing the existing Sign-In 10.1.0 NuGet. Its native and managed code remain unchanged; its current dependency ranges must not silently be widened.
Blocking status: blocks promoting the Firebase experiment to the default repository build/cutover. This is not a waiver of non-Firebase build support and not a claim of consumer compatibility. PR #256 remains a draft with publishing disabled.
Before cutover:
- Isolate the legacy native resolution and package-production baseline, or explicitly select already-published matching dependency packages without rebuilding them from Firebase 13 sources.
- Preserve native pins, package IDs, existing published payloads, and consumer dependency bounds for products outside the Firebase migration.
- Validate Google.SignIn production and its dependency-resolution evidence; document/test the supported legacy commands for deferred products.
- Avoid restoring the mixed-build guard as a substitute for working legacy builds.
Source review: #256 (comment)
Experiment: #256
Activity
AdamEssenmacher commentedon Nov 4, 2026
Implemented in PR #256, commit 7a3ffac. Non-Firebase production now uses a pinned, isolated pre-migration source tree; the original Google.SignIn command builds and packs its five-package baseline. Sign-In stays at 10.1.0.0 with unchanged public API, native pins and dependency declarations. A committed regression fixture verifies all five input fingerprints against the published 10.1.0 release. Metadata/native-reference inspection uses the same source baseline. Firebase 13 remains XBD-only; default/mixed requests partition the two producers without fallback.
Local validation: original Sign-In production command, exact CocoaPods resolution/native-package inspection, direct/transitive simulator/device/Catalyst offline consumers, 10 legacy-producer tests, 72 release-tool tests, 11 native-delivery tests and 125 audit tests passed. The Firebase 13 externals command also passed with a failing pod sentinel.
The new CI run includes a separate read-only legacy Sign-In/Firebase 12 integration lane: https://github.com/AdamEssenmacher/GoogleApisForiOSComponents/actions/runs/41920372109 . That refreshed CI is still in progress. The issue stays open pending validation and maintainer merge; no packages have been published.