Merge reactive scope refactor

src/changed.luau

@@ -0,0 +1,18 @@
+if not game then script = require "test/relative-string" end
+
+local action = require(script.Parent.action)()
+local cleanup = require(script.Parent.cleanup)
+
+local function changed<T>(property: string, callback: (T) -> ())
+    return action(function(instance)
+        local con = instance:GetPropertyChangedSignal(property):Connect(function()
+            callback((instance :: any)[property])
+        end)
+
+        cleanup(function()
+            con:Disconnect()
+        end)
+    end)
+end
+
+return changed