Scene save operations (in-place overwrite vs copy) (#126)

framework/src/lib/deref.spec.ts

@@ -35,4 +35,9 @@ describe("deref", () => {
 		const v3 = deref((() => {})());
 		expect(v3).toBe(undefined);
 	});
+
+	it("should return `undefined` when given an empty Ref", () => {
+		const derefed = deref(createRef());
+		expect(derefed).toBe(undefined);
+	});
 });

framework/src/lib/deref.ts

@@ -11,6 +11,9 @@ function isRef<T>(refOrValue: Ref<T> | T): refOrValue is Ref<T> {
 	if (!refOrValue || typeof refOrValue !== "object")
 		return false;
 
+	if (refOrValue instanceof Element)
+		return false;
+
 	const keys = Object.keys(refOrValue);
-	return keys.length === 1 && keys[0] === "value"
+	return keys.length === 0 || (keys.length === 1 && keys[0] === "value")
 }