Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibJS/Tests/operators/instanceof-basic.js

@@ -0,0 +1,36 @@
+test("basic functionality", () => {
+    function Foo() {
+        this.x = 123;
+    }
+
+    const foo = new Foo();
+    expect(foo instanceof Foo).toBeTrue();
+});
+
+test("derived ES5 classes", () => {
+    function Base() {
+        this.is_base = true;
+    }
+
+    function Derived() {
+        this.is_derived = true;
+    }
+
+    Object.setPrototypeOf(Derived.prototype, Base.prototype);
+
+    const d = new Derived();
+    expect(d instanceof Derived).toBeTrue();
+    expect(d instanceof Base).toBeTrue();
+});
+
+test("issue #3930, instanceof on arrow function", () => {
+    function f() {}
+    const a = () => {};
+
+    expect(() => {
+        f instanceof a;
+    }).toThrow(TypeError);
+    expect(() => {
+        a instanceof a;
+    }).toThrow(TypeError);
+});