fix(delete-user-data): kit/extension parity – spaces in EXT_SELECTED_EVENTS silently drop events #3259

delete-user-data kit/extension parity. Priority: low. A hand-written event list with spaces silently stops some events.

Difference

• Extension: the platform writes EXT_SELECTED_EVENTS from the types picked at install, with no spaces, so every selected type is published. (ext:export also writes it without spaces.)
• Kit: users write EXT_SELECTED_EVENTS by hand in .env. firebase-admin splits it on , without trimming, so a, b, c allows a but not " b" or " c". Every type after the first is dropped, with no warning.

Reproduced

EXT_SELECTED_EVENTS=firebase.extensions.delete-user-data.v1.firestore, firebase.extensions.delete-user-data.v1.database, firebase.extensions.delete-user-data.v1.storage

• Extension (all three selected): published firestore, database and storage.
• Kit: published only firestore.

Code

• Extension: event types declared in extension.yaml#L256-L270; the platform sets the env value.
• Kit: the raw string goes straight to channel() (events.ts#L30-L40).

Resolution

In setupEventChannel, pass an array: selectedEvents.split(",").map((s) => s.trim()).filter(Boolean). Treat an empty result the same as unset.