Typing class methods with Luau

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1

I use middleclass for OOP, and was wondering is there a way you can type methods with luau?

Lets say I have a class such as the following

local class = require(game.ReplicatedStorage.Middleclass)
local Unit_S = class("Unit_S")


function Unit_S:initialize(guid, template)
	self.GUID = guid
	self.Name = template.Name or "Unknown"
	self.Position = template.SpawnPosition or ZERO_VECTOR3
	self.Immune = 0
	-- etc.
end


function Unit_S:IsImmune(): boolean
	return self.Immune > 0
end

return Unit_S

And I want to type it like this:

export type CombatUnit = {
	IsImmune: () -> boolean,
}

It results in the following:

888×90 13.3 KB

I also tried

IsImmune: (CombatUnit) -> boolean,

to no avail.
Is it possible to type class methods at all?

2

this version works fine for me. even infers the type

image
image474×128 4.76 KB

you can also try IsImmune: (self: CombatUnit) -> boolean, for better autocompletion
image