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/functions/function-hoisting.js

@@ -0,0 +1,39 @@
+test("basic functionality", () => {
+    let callHoisted = hoisted();
+    function hoisted() {
+        return "foo";
+    }
+    expect(hoisted()).toBe("foo");
+    expect(callHoisted).toBe("foo");
+});
+
+// First two calls produce a ReferenceError, but the declarations should be hoisted
+test("functions are hoisted across non-lexical scopes", () => {
+    expect(scopedHoisted).toBeUndefined();
+    expect(callScopedHoisted).toBeUndefined();
+    {
+        var callScopedHoisted = scopedHoisted();
+        function scopedHoisted() {
+            return "foo";
+        }
+        expect(scopedHoisted()).toBe("foo");
+        expect(callScopedHoisted).toBe("foo");
+    }
+    expect(scopedHoisted()).toBe("foo");
+    expect(callScopedHoisted).toBe("foo");
+});
+
+test("functions are not hoisted across lexical scopes", () => {
+    const test = () => {
+        var iife = (function () {
+            return declaredLater();
+        })();
+        function declaredLater() {
+            return "yay";
+        }
+        return iife;
+    };
+
+    expect(() => declaredLater).toThrow(ReferenceError);
+    expect(test()).toBe("yay");
+});