feat: add await.lua

await.lua

@@ -0,0 +1,18 @@
+---Use like javascript's new Promise constructor (await(function(resolve) resolve(1) end))
+---@generic A
+---@param f fun(resolve: fun(a: A, ...: any))
+---@return A, any
+local function await(f)
+  local co = coroutine.running()
+  local ret
+  f(function(...)
+    if coroutine.status(co) == "running" then
+      ret = ret or table.pack(...)
+    else
+      coroutine.resume(co, ...)
+    end
+  end)
+  if ret then return table.unpack(ret, 1, ret.n) end
+  return coroutine.yield()
+end
+return await