Non-required extension parameters cannot be omitted

[oxc]

[REQUIRED] Environment info

firebase-tools: 9.3.0

Platform: Ubuntu (on WSL)

[REQUIRED] Test case

Install firestore-send-email extension with a --params file, which does not specify the (optional) parameter DEFAULT_REPLY_TO.

[REQUIRED] Steps to reproduce

# create params file
echo 'LOCATION=europe-west3
SMTP_CONNECTION_URI=smtps://foo
MAIL_COLLECTION=mail
DEFAULT_FROM=test@example.org' > send-email.env

# try to install extension
firebase --non-interactive ext:install firestore-send-email --params='send-email.env'

# Answer questions with yes multiple times (--non-interactive does not help here)

[REQUIRED] Expected behavior

The extension installs correctly, with all non-required parameters that have not been specified omitted.

[REQUIRED] Actual behavior

The extension fails to install with:

Error: DEFAULT_REPLY_TO has not been set in the given params file and there is no default available. Please set this variable before installing again.

More details:

The issue arises in the following check:
https://github.com/firebase/firebase-tools/blob/master/src/extensions/extensionsHelper.ts#L144
This should skip parameters that don't have required: true in their specification.

I tried to workaround with setting the optional parameters to empty values, but that does not work either, because the abovementioned check checks for a truthy value, instead of checking for undefined.