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Added first draft of the September Luau Recap

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ajeffrey@roblox.com 2021-09-27 18:22:24 -05:00
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---
layout: single
title: "Luau Recap: September 2021"
---
Luau is our new language that you can read more about at [https://luau-lang.org](https://luau-lang.org).
[Cross-posted to the [Roblox Developer Forum](https://devforum.roblox.com/t/luau-recap-september-2021/).]
## Editor features
We have made some improvements to the Luau-powered autocomplete beta feature in Roblox Studio:
* We no longer give autocomplete suggestions for client-only APIs in server-side scripts,
or vice versa.
* For table literals with known shape, we provide autocomplete suggestions for properties.
* We provide autocomplete suggestions for `Player.PlayerGui`.
* Keywords such as `then` and `else` are autocompleted better.
* Autocompletion is disabled inside a comment span (a comment starting `--[[`).
## Typechecking improvements
The big news this month is that generic functions are back!
*write-up of generics goes here*
In other typechecking news:
* The Luau constraint resolver can now refine the operands of equality expressions.
* We fixed some crashes caused by UAF during type inference.
* We do a better job of tracking updates when script is moved inside the data model.
* We fixed one of the ways that [recursive types could cause free types to leak](https://devforum.roblox.com/t/free-types-leaked-into-this-modules-public-interface/1459070).
* We improved the way that `return` statements interact with mutually recursive
function declarations.
* We improved parser recovery from code which looks like a function call (but isn't) e.g.
```
local x = y
(expr)[smth] = z
```
* We consistently report parse errors before type errors.
* We display more types as `*unknown*` rather than as an internal type name like `error####`.
* Luau now infers the result of `Instance:Clone()` much more accurately.
* Luau type guard refinements now support more arbitrary cases, for instance `typeof(foo) ~= "Instance"` eliminates anything not a subclass of Instance.
## Performance improvements
* We optimized the performance of the `Vector3.new` constructor.
## Other improvements
* We fixed some GC issues where objects could become "zombies".
* We relaxed the Parallel Lua constraints when dispatching deferred events.