lazy.lua

local mod = {}

local meta = {
	__call = function(tab, ...)
		if not tab.func then
			tab.func = tab.loader()
		end

		tab.func(...)
	end
}

function mod.lazyfunc(loader)
	return setmetatable({loader=loader}, meta)
end

return mod

some_func.lua

print "I have been required"

return function(str)
	print(("%s says hello ♥"):format(str))
end

test.moon

import lazyfunc from require "lazy"

func = lazyfunc -> require "some_func"
print "Lazy loading function created"

func("moonscript")