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_clock.js

@@ -0,0 +1,37 @@
+const test = require('tap').test;
+const Clock = require('../../src/io/clock');
+const Runtime = require('../../src/engine/runtime');
+
+test('spec', t => {
+    const rt = new Runtime();
+    const c = new Clock(rt);
+
+    t.type(Clock, 'function');
+    t.type(c, 'object');
+    t.type(c.projectTimer, 'function');
+    t.type(c.pause, 'function');
+    t.type(c.resume, 'function');
+    t.type(c.resetProjectTimer, 'function');
+    t.end();
+});
+
+test('cycle', t => {
+    const rt = new Runtime();
+    const c = new Clock(rt);
+
+    t.ok(c.projectTimer() <= 0.1);
+    setTimeout(() => {
+        c.resetProjectTimer();
+        setTimeout(() => {
+            // The timer shouldn't advance until all threads have been stepped
+            t.ok(c.projectTimer() === 0);
+            c.pause();
+            t.ok(c.projectTimer() === 0);
+            c.resume();
+            t.ok(c.projectTimer() === 0);
+            t.end();
+        }, 100);
+    }, 100);
+    rt._step();
+    t.ok(c.projectTimer() > 0);
+});