[Nibelheim]

As an example:

Top of first .Lua file

local addon, ns = ...
local Funs, Settings = unpack(select(2, ...))
 
Settings.defaults = {
   x = 0,
   y = 0,
}
 
Funs.updateSettings = function()
    -- do stuff
end

Second file

local Funs, Settings = unpack(select(2, ...))
 
local Init = function()
    Funs.updateSettings()
    print(Settings.x, Settings.y)
end

You can now access thingies from any file within your addon, as each file in your addon shares a hidden passed argument.