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94 lines
3.1 KiB
Markdown
94 lines
3.1 KiB
Markdown
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---
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layout: single
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title: "Luau Recap: July 2023"
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---
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Our team is still spending a lot of time working on upcoming replacement for our type inference engine as well as working on native code generation to improve runtime performance.
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However, we also worked on unrelated improvements during this time that are summarized here.
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[Cross-posted to the [Roblox Developer Forum](https://devforum.roblox.com/t/luau-recap-july-2023/).]
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## Analysis improvements
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Indexing table intersections using `x["prop"]` syntax has been fixed and no longer reports a false positive error:
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```lua
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type T = { foo: string } & { bar: number }
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local x: T = { foo = "1", bar = 2 }
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local y = x["bar"] -- This is no longer an error
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```
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Generic `T...` type is now convertible to `...any` variadic parameter.
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This solves issues people had with variadic functions and variadic argument:
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```lua
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local function foo(...: any)
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print(...)
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end
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local function bar<T...>(...: T...)
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foo(...) -- This is no longer an error
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end
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```
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We have also improved our general typechecking performance by ~17% and by additional ~30% in modules with complex types.
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Other fixes include:
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* Fixed issue with type `T?` not being convertible to `T | T` or `T?` which could've generated confusing errors
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* Return type of `os.date` is now inferred as `DateTypeResult` when argument is "*t" or "!*t"
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## Runtime improvements
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Out-of-memory exception handling has been improved.
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`xpcall` handlers will now actually be called with a "not enough memory" string and whatever string/object they return will be correctly propagated.
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Other runtime improvements we've made:
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* Performance of `table.sort` was improved further. It now guarantees N*log(N) time complexity in the worst case
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* Performance of `table.concat` was improved by ~5-7%
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* Performance of `math.noise` was improved by ~30%
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* Inlining of functions is now possible even when they used to compute their own arguments
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* Improved logic for determining whether inlining a function or unrolling a loop is profitable
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## Autocomplete improvements
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An issue with exported types not being suggested is now fixed.
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## Debugger improvements
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We have fixed the search for the closest executable breakpoint line.
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Previously, breakpoints might have been skipped in `else` blocks at the end of a function.
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This simplified example shows the issue:
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```lua
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local function foo(isIt)
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if isIt then
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print("yes")
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else
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-- When 'true' block exits the function, breakpoint couldn't be placed here
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print("no")
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end
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end
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```
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## Thanks
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A very special thanks to all of our open source contributors:
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* [Petri Häkkinen](https://github.com/petrihakkinen)
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* [JohnnyMorganz](https://github.com/JohnnyMorganz)
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* [Gael](https://github.com/TheGreatSageEqualToHeaven)
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* [Jan](https://github.com/Jan200101)
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* [Alex Orlenko](https://github.com/khvzak)
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* [mundusnine](https://github.com/mundusnine)
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* [Ben Mactavsin](https://github.com/BenMactavsin)
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* [RadiatedExodus](https://github.com/RealEthanPlayzDev)
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* [Lodinu Kalugalage](https://github.com/imlodinu)
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* [MagelessMayhem](https://github.com/MagelessMayhem)
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* [Someon1e](https://github.com/Someon1e)
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