At least when I visited (which was about 6 months ago I believe?), it was a fairly basic set of extensions on top of Lua. As in, they've added a couple keywords that I believe they just RegExp for (its pretty simple to confuse the language parser) - the language itself seems to not be the focus (yet?) of the project.
Again, I only used it once (and I made a DynamicLand compiler in DynamicLand! Video here: https://twitter.com/i/web/status/963497112284512256 ), but if I recall correctly, the main way to "share functions", was to actually just load someone's code and copy it. Partially because the language/editing seems very new still, and perhaps partially to encourage this sort of "real world sharing" vs. virtual sharing. I recall just "forking" files a lot and making new copies of things (kind of like "Old" folders I used to make before version control).
Again, I only used it once (and I made a DynamicLand compiler in DynamicLand! Video here: https://twitter.com/i/web/status/963497112284512256 ), but if I recall correctly, the main way to "share functions", was to actually just load someone's code and copy it. Partially because the language/editing seems very new still, and perhaps partially to encourage this sort of "real world sharing" vs. virtual sharing. I recall just "forking" files a lot and making new copies of things (kind of like "Old" folders I used to make before version control).