We're currently standing up a sharepoint-server environment, migrating from SP 2010. There are a handful of webparts and event handlers that will need to be rewritten to support 2019.
I've gone down the path of looking at SPFx and all of the related tooling.
I'm more than comfortable with the change, but what I can't determine is when/if SPFx features were designed for sharepoint-online only or aren't supported with the current version of 2019 and will be supported in a future release.
- Is there a way to determine what version of SPFx is supported?
- Do CU's or other patches update this support frequently?
If there is going to be a drastic difference in parity between online and on-prem, I'd like to be able to know before continuing to develop.
- What is supported in each SPFx version?
I can mostly look at changelogs for the answer to this one, but are there any gotchas I should know about? (might be crossing an opinion border here)