Update:

Jetpack now has its own built-in Markdown block:

I’d highly recommend using it instead :)

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Original post below:

I’ve been playing around with Gutenberg a tiny bit recently and have realized that, at least in my case, it kind of eats the Jetpack Markdown module and doesn’t offer full markdown support.

I honestly know nothing about writing blocks for Gutenberg, but luckily GitHub user nuzzio does :)

This recent, but now closed PR to Jetpack was pretty much everything necessary to build a working block.

I’ve put my code up on GitHub as a WordPress plugin:

Like I said, I don’t know what I’m doing–so consider this plugin super beta.