add gs

RCCService2018/content/LuaPackages/RoactImpl/Core.lua

@@ -0,0 +1,24 @@
+--[[
+	Provides a set of markers used for annotating data in Roact.
+]]
+
+local Symbol = require(script.Parent.Symbol)
+
+local Core = {}
+
+-- Marker used to specify children of a node.
+Core.Children = Symbol.named("Children")
+
+-- Marker used to specify a callback to receive the underlying Roblox object.
+Core.Ref = Symbol.named("Ref")
+
+-- Marker used to specify that a component is a Roact Portal.
+Core.Portal = Symbol.named("Portal")
+
+-- Marker used to specify that the value is nothing, because nil cannot be stored in tables.
+Core.None = Symbol.named("None")
+
+-- Marker used to specify that the table it is present within is a component.
+Core.Element = Symbol.named("Element")
+
+return Core