What does export do?

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#1

I recently saw a global variable but I don’t know why and what it’s used for. I saw this piece of code:

export type Listener = {Command : string, Callback : () -> nil, StopListening : () -> nil}

What does it do?

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What's export key word in roblox lua?
#2

It exports the type Listener (for type annotations) so it can be used in other modules using require.

#3

Mind giving me an example of how to require it in other modules?

#4

An example, with two scripts, one of them being ModuleScript while other could be any script.

Module 1

local ModuleScript1 = { }
export type Point { x: number, y: number }

function ModuleScript1.example1(): Point
        return {
                x = 1,
                y = 2,
        }
end

return ModuleScript1

LocalScript 1

local ModuleScript1 = require(ModuleScript1) -- now the type Point is imported from ModuleScript1, to access it use the dot syntax

local myVariable: ModuleScript1.Point = ModuleScript1.example1() -- myVariable annotated with the type Point
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