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52 lines
1.8 KiB
Markdown
52 lines
1.8 KiB
Markdown
---
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layout: single
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title: "Luau Recap: April 2022"
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---
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Luau is our new language that you can read more about at [https://luau-lang.org](https://luau-lang.org).
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[Cross-posted to the [Roblox Developer Forum](https://devforum.roblox.com/t/luau-recap-april-2022/).]
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It's been a bit of a quiet month. We mostly have small optimizations and bugfixes for you.
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It is now allowed to define functions on sealed tables that have string indexers. These functions will be typechecked against the indexer type. For example, the following is now valid:
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```lua
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local a : {[string]: () -> number} = {}
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function a.y() return 4 end -- OK
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```
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Autocomplete will now provide string literal suggestions for singleton types. eg
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```lua
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local function f(x: "a" | "b") end
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f("_") -- suggest "a" and "b"
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```
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Improve error recovery in the case where we encounter a type pack variable in a place where one is not allowed. eg `type Foo<A...> = { value: A... }`
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When code does not pass enough arguments to a variadic function, the error feedback is now better.
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For example, the following script now produces a much nicer error message:
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```lua
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type A = { [number]: number }
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type B = { [number]: string }
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local a: A = { 1, 2, 3 }
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-- ERROR: Type 'A' could not be converted into 'B'
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-- caused by:
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-- Property '[indexer value]' is not compatible. Type 'number' could not be converted into 'string'
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local b: B = a
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```
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If the following code were to error because `Hello` was undefined, we would erroneously include the comment in the span of the error. This is now fixed.
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```lua
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type Foo = Hello -- some comment over here
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```
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Fix a crash that could occur when strict scripts have cyclic require() dependencies.
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Add an option to autocomplete to cause it to abort processing after a certain amount of time has elapsed.
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