Hi Creators,
The Roblox Luau team is busy working on large updates coming in the near future, but just like last time, we have some new improvements that you can start using today.
Let’s get to it!
Analysis improvements
Indexing table intersections using x["prop"] syntax has been fixed and no longer reports a false positive error:
--!strict
type T = { foo: string } & { bar: number }
local x: T = { foo = "1", bar = 2 }
local y = x["bar"] -- This is no longer an error
Generic T... type is now convertible to ...any variadic parameter.
This solves issues people had with variadic functions and variadic argument:
--!strict
local function foo(...: any)
print(...)
end
local function bar<T...>(...: T...)
foo(...) -- This is no longer an error
end
We have also improved our general typechecking performance by ~17% and by additional ~30% in modules with complex types.
Other fixes include:
- Fixed issue with type
T?not being convertible toT | TorT?which could’ve generated confusing errors - Return type of
os.dateis now inferred asDateTypeResultwhen argument is “*t” or “!*t”
Runtime improvements
Out-of-memory exception handling has been improved. xpcall handlers will now actually be called with a “not enough memory” string and whatever string/object they return will be correctly propagated.
Other runtime improvements we’ve made:
- Performance of
table.sortwas improved further. It now guarantees N*log(N) time complexity in the worst case - Performance of
table.concatwas improved by ~5-7% - Performance of
math.noisewas improved by ~30% - Inlining of functions is now possible even when they used to compute their own arguments
- Improved logic for determining whether inlining a function or unrolling a loop is profitable
Autocomplete improvements
An issue with exported types not being suggested is now fixed.
Debugger improvements
We have fixed the search for the closest executable breakpoint line.
Previously, breakpoints might have been skipped in else blocks at the end of a function. This simplified example shows the issue:
local function foo(isIt)
if isIt then
print("yes")
else
-- When 'true' block exits the function, breakpoint couldn't be placed here
print("no")
end
end
This is all for now, and as always, we would like to thank the community for all the open-source contributions to Luau on GitHub!
