Issue with typechecking when initializing a module in another module

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#1

I have a Queue module that is created with a simple:

function Queue:New()
	local o = {}
	setmetatable(o, self)
	self.__index = self
	o.Queue = {}
	return o
end

I have another module for popups that wants to use this queue:

--!strict
local QueueClass = require(*//QueueClass path//*)
local module = {}
module.__index = module

function module:StartPopupManager()
	self.queue = QueueClass:New()
	...
end

Issue is that I get this warning:

Table type 'Queue' not compatible with type 't1 where t1 = {+ __index: t1 +}' 
because the former is missing field '__index'

When I try to require and initiate QueueClass in a regular script it does not give out this warning.
Would appreciate help with this as I don’t understand the issue.

#2

Do you have a type def for Queue somewhere? I.e. type Queue = ...

#3 
local Queue = {}

--functions

return Queue

Queue is the table the modulescript returns on require

#4

OK thank you so much, I added .__index to the module, I forgot!