Small refactoring, set variable node

js/entity/UnionType.js

@@ -0,0 +1,21 @@
+/**
+ * @template T
+ * @typedef {import("./TypeInitialization").AnyValueConstructor<T>} AnyValueConstructor
+ */
+
+export default class UnionType {
+
+    #types
+    get types() {
+        return this.#types
+    }
+
+    /** @param  {...AnyValueConstructor<any>} types */
+    constructor(...types) {
+        this.#types = types
+    }
+
+    getFirstType() {
+        return this.#types[0]
+    }
+}