Initial commit of 001code-html Scratch frontend project.

Includes scratch-gui, scratch-vm, scratch-blocks, scratch-render, scratch-l10n, and deployment config.

Co-authored-by: Cursor <cursoragent@cursor.com>

scratch-gui/test/unit/util/throttled-property-hoc.test.jsx

@@ -0,0 +1,54 @@
+import React from 'react';
+import {mount} from 'enzyme';
+
+import ThrottledPropertyHOC from '../../../src/lib/throttled-property-hoc.jsx';
+
+describe('VMListenerHOC', () => {
+    let mounted;
+    const throttleTime = 500;
+    beforeEach(() => {
+        const Component = ({propToThrottle, doNotThrottle}) => (
+            <input
+                name={doNotThrottle}
+                value={propToThrottle}
+            />
+        );
+        const WrappedComponent = ThrottledPropertyHOC('propToThrottle', throttleTime)(Component);
+
+        global.Date.now = () => 0;
+
+        mounted = mount(
+            <WrappedComponent
+                doNotThrottle="oldvalue"
+                propToThrottle={0}
+            />
+        );
+    });
+
+    test('it passes the props on initial render ', () => {
+        expect(mounted.find('[value=0]').exists()).toEqual(true);
+        expect(mounted.find('[name="oldvalue"]').exists()).toEqual(true);
+    });
+
+    test('it does not rerender if throttled prop is updated too soon', () => {
+        global.Date.now = () => throttleTime / 2;
+        mounted.setProps({propToThrottle: 1});
+        mounted.update();
+        expect(mounted.find('[value=0]').exists()).toEqual(true);
+    });
+
+    test('it does rerender if throttled prop is updated after throttle timeout', () => {
+        global.Date.now = () => throttleTime * 2;
+        mounted.setProps({propToThrottle: 1});
+        mounted.update();
+        expect(mounted.find('[value=1]').exists()).toEqual(true);
+    });
+
+    test('it does rerender if a non-throttled prop is changed', () => {
+        global.Date.now = () => throttleTime / 2;
+        mounted.setProps({doNotThrottle: 'newvalue', propToThrottle: 2});
+        mounted.update();
+        expect(mounted.find('[name="newvalue"]').exists()).toEqual(true);
+        expect(mounted.find('[value=2]').exists()).toEqual(true);
+    });
+});