fix compiling issues

src/Util/RootID.js

@@ -0,0 +1,14 @@
+
+export default class RootID {
+  constructor (name, typeConstructor) {
+    this.user = -1
+    this.name = name
+    this.type = StructManager.getReference(typeConstructor)
+  }
+  equals (id) {
+    return id !== null && id.user === this.user && id.name === this.name && id.type === this.type
+  }
+  lessThan (id) {
+    return this.user < id.user || (this.user === id.user && (this.name < id.name || (this.name === id.name && this.type < id.type)))
+  }
+}