LibJS: Implement Temporal.Duration.prototype.valueOf

Author: https://github.com/trflynn89
Commit: f57ff63432
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2431
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/shannonbooth ✅

Libraries/LibJS/Tests/builtins/Temporal/Duration/Duration.prototype.valueOf.js

@@ -0,0 +1,7 @@
+describe("errors", () => {
+    test("throws TypeError", () => {
+        expect(() => {
+            new Temporal.Duration().valueOf();
+        }).toThrowWithMessage(TypeError, "Cannot convert Temporal.Duration to a primitive value");
+    });
+});