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frontend-app-api: hand off finalized apps through callback

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Replace the prepared app promise/snapshot finalization API with an onFinalized callback so bootstrap consumers can switch to the finalized app through a simple one-way handoff.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor
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Patrik Oldsberg
2026-03-14 08:39:42 +01:00
parent 89f83827c9
commit 01d3c2ec0f
2 changed files with 10 additions and 7 deletions
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.changeset/prepare-specialized-app-signin-flow.md
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'@backstage/frontend-defaults': patch
---
Adds `prepareSpecializedApp` as a new two-phase app wiring API for rendering a bootstrap tree before full app finalization. The bootstrap phase is now exposed as a partial app tree that consumers can render while subscribing to phase transitions, while the opaque reusable `sessionState` is stored internally on the prepared app and returned from `getFinalizedApp()` and `finalize()`. That session state can also be passed into a future `prepareSpecializedApp` call to skip sign-in and reuse the prepared session. The existing `createSpecializedApp` API is now deprecated and backed by `prepareSpecializedApp().finalize()`, while `createApp` has been updated to use the same prepare/finalize flow.
Adds `prepareSpecializedApp` as a new two-phase app wiring API for rendering a bootstrap tree before full app finalization. The bootstrap phase is exposed as a partial app tree through `getBootstrapApp()`, while `onFinalized()` provides a one-way handoff to the finalized app once bootstrap completes. The opaque reusable `sessionState` is returned from the finalized app and can be passed into a future `prepareSpecializedApp` call to skip sign-in and reuse the prepared session. The existing `createSpecializedApp` API is now deprecated and backed by `prepareSpecializedApp().finalize()`, while `createApp` has been updated to use the same prepare/finalize flow.