Nukkit VS PocketMine-MP

NukkitX by default doesn't have anything above 1.12 Mineacraft. It also doesn't have maps by default (though you can use a plugin for this). One other way to see is taking a look at the currently open GitHub issues.

I'm not the most well versed in Bedrock servers, but I think you could use something like Nukkit or PocketMine-MP for the mean time, as they should have 1.18.3 versions still up for download.

Is there any documentation on Minecraft bedrock server. How do Nukkit, PocketMine and potentially other server software figure out everything. Or is it just reverse engineering. If so, how can they update to new versions so quickly. All I could find was about addons and commands. (This) Or maybe someone's doing all the work on figuring out and sharing and all server developers just use it?

Oh no, my bad, back then there was a multiplayer server system. I can't find any file, but I found a github with a project that can be interesting for you: https://github.com/pmmp/PocketMine-MP/blob/stable/changelogs/1.3.md

PocketMine-MP is written in PHP

Take a look at PMMP (Pocketmine) https://pmmp.io/ (Not the only option but quite popular) They provide custom plugins via PHP. https://poggit.pmmp.io/ - repository public plugins - several other sources exist just have to do some googling.

I'm not the most well versed in Bedrock servers, but I think you could use something like Nukkit or PocketMine-MP for the mean time, as they should have 1.18.3 versions still up for download.

You better believe it! https://github.com/pmmp/PocketMine-MP

long answer: amp is a full framework including other context-specific components like event loops, web framework, etc. It is too bloated for the usual use case in our community (which is primarily phar plugins for PocketMine-MP). await-generator only provides the basic async executor (which dispatches the generator) plus a few basic context-agnostic synchronization primitives like async iterators, mutex and channels. It does not depend on any runtime (it does not even have a scheduler). furthermore, I am not a fan of the Promise/Generator split in amp, which increases the cognitive complexity of an API. btw, await-generator is not Promise/A+ compliant using the equivalent definitions, because a lack of runtime implies it is unable to satisfy 2.2.4 (execute subsequent operations with clear stack), i.e. exceptions thrown after yielding might end up generating enormous stack traces (await-generator has manual tail recursion optimization to mitigate this). You could always write a framework-specific function that takes in a generator and yields from it after the framework finishes the current stack though.

Not really. Just a proof of concept tbh. It's probably nice that you can view phar files on mobile when you really need it though. We have a community https://pmmp.io where all plugins are distributed as phar files, and people are struggling to try to "edit" phar files to modify source code all the time.

Is there any documentation on Minecraft bedrock server. How do Nukkit, PocketMine and potentially other server software figure out everything. Or is it just reverse engineering. If so, how can they update to new versions so quickly. All I could find was about addons and commands. (This) Or maybe someone's doing all the work on figuring out and sharing and all server developers just use it?