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-vm/test/unit/io_mousewheel.js

@@ -0,0 +1,44 @@
+const test = require('tap').test;
+const MouseWheel = require('../../src/io/mouseWheel');
+const Runtime = require('../../src/engine/runtime');
+
+test('spec', t => {
+    const rt = new Runtime();
+    const mw = new MouseWheel(rt);
+
+    t.type(mw, 'object');
+    t.type(mw.postData, 'function');
+    t.end();
+});
+
+test('blocks activated by scrolling', t => {
+    let _startHatsArgs;
+    const rt = {
+        startHats: (...args) => {
+            _startHatsArgs = args;
+        }
+    };
+    const mw = new MouseWheel(rt);
+
+    _startHatsArgs = null;
+    mw.postData({
+        deltaY: -1
+    });
+    t.strictEquals(_startHatsArgs[0], 'event_whenkeypressed');
+    t.strictEquals(_startHatsArgs[1].KEY_OPTION, 'up arrow');
+
+    _startHatsArgs = null;
+    mw.postData({
+        deltaY: +1
+    });
+    t.strictEquals(_startHatsArgs[0], 'event_whenkeypressed');
+    t.strictEquals(_startHatsArgs[1].KEY_OPTION, 'down arrow');
+
+    _startHatsArgs = null;
+    mw.postData({
+        deltaY: 0
+    });
+    t.strictEquals(_startHatsArgs, null);
+
+    t.end();
+});