Oh ok thank you for clarifying.
1 Like
Luau is fully backwards compatible with code written for Lua. The Luau compiler should always execute Lua code as it is expected Lua would.
Roblox Studio doesnāt run Lua. It runs Luau. Code written in standard Lua 5.1 will run without issue. Hope that helps explain!
It hasnāt been used for quite a bit, itās LuaU instead. The keywords, syntax, etc. is almost exactly that of Lua.
LuaU serves as a ābetter Lua.ā
What language do you use?
Luau
Whatās that?
Its a derivative of lua.
Whatās that?
3 Likes
I donāt know where people got the impression itās called LuaU but it super isnāt and never has been. Itās Luau. As in, the Hawaiian word.
3 Likes
this is so cool!
i wish i can contribute but
the "but"
I canāt wait for that too, what do you think people could make using this? (ideas)
1 Like
Is it possible that the task library gets added to the open source version? At least task.spawn for resuming threads with no issues like with errors not showing up when you use coroutine.resume?
I understand how task.wait, task.defer, task.delay, etc (anything dependant on RunService stuff) couldnāt be added, but task.spawn is something I use quite a lot, and something that I could see being possible to add since coroutine.wrap does the same thing if youāre using functions.
Itās nice that it also still has the same meaning and is pronounced the same in Portuguese (Brazil) too 
Thanks however came up with that name.
2 Likes
Wow, Iām so happy to be getting into scripting at this time!
Open Sourcing is such an achievement because it allows for so many favorable possibilities!
Iām not too familiar with IDEs, but I wonder if a new IDE can be made similar to IntelliJ (a Java Devs favorite :P) because thatād be awesome!
Canāt wait to see all the amazing things which come from this.
amazing work! weāre so proud community lovely support can feature luau to open source tbh for making studio for lua skilled about that in C++ programmer can any making contributions for support source, thank you for looking how can system on working luau, thatās it how for in C++ programmer support creations from feature
1 Like
Im wondering if someone could make a open-source Luau implementation of io or FileSystemService
Or I could stop being lazy and learn C++ already so I can do if myself.
We discussed io internally recently. Unsure what to think about this yet, itās a pain not to have that in the CLI but it also breaks sandboxing for CLI-based script execution. Maybe we should do this and require explicit --io argument or consent similar to what deno does these daysā¦ weāll see. It shouldnāt be too difficult to hook up otherwise.
4 Likes
Hurray! Question: How does multithreading (as in utilizing multiple CPU cores, not coroutines) work in Luau? Didnāt @zeuxcg mention something about this in RDC?
Excited to use this for my non Roblox projects.
1 Like
This is the truth. Actually, open source is a major means of reducing the possibility of exploitation. Using an entire community of dedicated contributors amongst many different fields is a great way to quickly spot and eliminate vulnerabilities.
2 Likes
No you canāt, thatās a Roblox engine thing, not a Luau thing.
And thereās no RunService, or any other service, instances donāt exist.
However, it does mean that if youāre building / integrating with an engine, that if you in this case have events like RenderStepped, then you can move resources made by the community such as BoatTween to use your engineās code in a much easier matter, without having to rewriting as much code.
2 Likes
Iām awfully late to the party but this caught my eye.
This could impact exploits because they can now see the structures without having to sift through a decompiler dump of the engine for their goodies (LuaUc-api? Play on the original luac name.) such as in original lua 5.1, luac_getglobal; the list goes on of course.
But overall not much of an impact Iād say. Though this may end up leading to exploit developers optimizing their compilers/bytecodeā¦ 
1 Like
You run a separate virtual machine for each thread. Synchronization between the virtual machines is to be handled by the host application embedding Luau.
Exploit developers no need to have special compilers/bytecode, they can just include Luau as a git submodule and instantly have execution with extremely fast response to Roblox updates.
I canāt wait to see a version of studio that allow the development of an offline game!
Iām so excited
That would require open sourcing the entire roblox engine, which is not the case here. This is only for the luau engine which is what all the scripts and plug-ins run on.
1 Like