plugin: Miscellaneous cleanup

plugin/src/PatchSet.lua

@@ -0,0 +1,25 @@
+--[[
+	Methods to operate on either a patch created by the hydrate method, or a
+	patch returned from the API.
+]]
+
+local t = require(script.Parent.Parent.t)
+
+local Types = require(script.Parent.Types)
+
+local PatchSet = {}
+
+PatchSet.validate = t.interface({
+	removed = t.array(t.union(Types.RbxId, t.Instance)),
+	added = t.map(Types.RbxId, Types.ApiInstance),
+	updated = t.array(Types.ApiInstanceUpdate),
+})
+
+--[[
+	Invert the given PatchSet using the given instance map.
+]]
+function PatchSet.invert(patchSet, instanceMap)
+	error("not yet implemented", 2)
+end
+
+return PatchSet