fix(firestore-send-email): kit/extension parity – ext:migrate truncates settings containing # #3303

firestore-send-email kit/extension parity. Priority: low. ext:migrate cuts off any setting that contains #.

Difference

• Extension: values are stored as entered. DEFAULT_FROM and MAIL_COLLECTION accept #, and DEFAULT_REPLY_TO, USERS_COLLECTION and TEMPLATES_COLLECTION aren't validated.
• Kit:
  • ext:migrate, ext:export and kits:install write values to .env unquoted unless they contain an escape character.
  • The .env parser then treats # as the start of a comment.
  • The kit never re-validates .env values, so nothing catches the shortened value.

Reproduced

Values written and read back with firebase-tools 15.31.0's own .env writer and parser:

Code

• Extension regexes allowing #: extension.yaml#L311, #L325
• The writer is firebase-tools functions/env.js formatUserEnvForWrite.

Resolution

Fix upstream in firebase-tools by quoting values that contain # (or whitespace) when writing .env. Until then, document it in the kit's migration notes.