With an update of node-ical from 0.13.0 to 0.14.1 the installation of mm was broken when using npm install --no-optional because the used luxon package was missing. So I reverted node-ical back to 0.13.0 in develop.

Today I digged deeper into this and found

• node-ical v13 uses rrule v2.6.8
• node-ical v14 uses rrule v2.6.4

So node-ical did a downgrade of rrule due to this issue.

AFAIS there are breaking changes in rrule after v2.6.4 which also may impact this project because the master branch (= latest release) is using rrule v2.6.8.

We have now 2 options:

• stay on node-ical v13 / rrule v2.6.8
• use node-ical / rrule v2.6.4 and add missing "luxon": "^1.21.3" to dependencies in package.json as workaround.

I'm to far away from the calendar stuff, so I can't decide this ...