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frontend-app-api: freeze materialized bootstrap APIs

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Keep deferred API overrides only for bootstrap APIs that were never materialized, while reporting and ignoring overrides of implementations that were already used during bootstrap.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor
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Patrik Oldsberg
2026-03-15 21:46:53 +01:00
parent f919c714fc
commit d7a44138d2
5 changed files with 231 additions and 8 deletions
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.changeset/prepare-specialized-app-frontend-app-api.md
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'@backstage/frontend-app-api': patch
---
Added `prepareSpecializedApp` for two-phase app wiring so apps can render a bootstrap tree before full app finalization. The bootstrap phase now supports deferred `app/root.elements`, predicate-gated APIs, reusable `sessionState`, and warnings for bootstrap-visible predicates or bootstrap code that accessed APIs that only became available after finalization.
Added `prepareSpecializedApp` for two-phase app wiring so apps can render a bootstrap tree before full app finalization. The bootstrap phase now supports deferred `app/root.elements`, predicate-gated APIs, reusable `sessionState`, and warnings for bootstrap-visible predicates or bootstrap code that accessed APIs that only became available after finalization. Utility APIs that are materialized during bootstrap are also frozen for the lifetime of the app instance, causing deferred overrides of those APIs to be ignored and reported as app errors.