-- main.lua
function love.load()
    someFileLoader("script.lua", "functions.lua")
end
function somePrivateFunction()
    -- NO ACCESS TO THIS FUNCTION
end


-- script.lua
somePrivateFunction() -- SHOULDNT WORK
someOtherFunction()   -- SHOULD WORK


-- functions.lua
function someOtherFunction()
    -- HAVE ACCESS TO THIS FUNCTION
end