lua_async/async_await.lua

local unpack = unpack or table.unpack

function async(func)
	return function(...)
		local promise = Promise()
		promise.__on_resolve = func

		local args = {...}

		lua_async.resume(coroutine.create(function()
			promise:resolve(unpack(args))
		end))

		return promise
	end
end

function await(promise)
	local co = assert(coroutine.running(), "await called outside of an async function")

	if promise.state == "pending" then
		promise:then_(function()
			lua_async.resume(co)
		end)

		coroutine.yield()
	end

	return unpack(promise.values)
end