Export Usage and API

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#1

Export

Hello! Im a scripter. When I was reading through PartCache , I noticed this bit of code:

-- TYPE DEFINITION: Part Cache Instance
export type PartCache = {
	Open: {[number]: BasePart},
	InUse: {[number]: BasePart},
	CurrentCacheParent: Instance,
	Template: BasePart,
	ExpansionSize: number
}

I’m a little confused what this means, and hoping someone can clarify! Thanks!

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#2

it means in this format

local PartCache = {
   Open = false; -- is it available or as open
   InUse = false; -- is sombody using it or is it in use?
   CurrentCacheParent = "Part"; -- what is its parent
   Template = "BasePart"; -- what type of object is this?
   ExpansionSize = Vector3.new(0,0,0) -- What size is it
}
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#3

Im still a little confused… meaning what does export type even do…

#4

This is Luau’s type checking. Not sure how it works but it comes from Luau which is ROBLOX’s language based on Lua.

Scroll all the way down in the link I provided and there’s a module interactions section.

By default type aliases are local to the file they are declared in. To be able to use type aliases in other modules using require , they need to be exported:

export type Point = { x: number, y: number }