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/tw_util_async_limiter.js

@@ -0,0 +1,64 @@
+const AsyncLimiter = require('../../src/util/async-limiter');
+const {test} = require('tap');
+
+test('Runs callback', async t => {
+    /* eslint-disable-next-line require-await */
+    const callback = async (a, b) => a + b;
+
+    const limiter = new AsyncLimiter(callback, 2);
+
+    t.same(await Promise.all([
+        limiter.do(1, 2),
+        limiter.do(3, 4),
+        limiter.do(5, 6),
+        limiter.do(7, 8),
+        limiter.do(9, 10)
+    ]), [
+        3,
+        7,
+        11,
+        15,
+        19
+    ]);
+    t.end();
+});
+
+test('Errors', async t => {
+    t.plan(1);
+    const errorObject = new Error('Testing testing 123'); // want to get the same *exact* object back
+    const callback = () => Promise.reject(errorObject);
+    const limiter = new AsyncLimiter(callback, 10);
+    try {
+        await limiter.do();
+    } catch (e) {
+        t.equal(e, errorObject);
+    }
+    t.end();
+});
+
+test('Limit and queue', async t => {
+    const calls = [];
+    const callback = () => new Promise(resolve => {
+        calls.push({
+            resolve
+        });
+    });
+
+    const limiter = new AsyncLimiter(callback, 5);
+
+    for (let i = 0; i < 12; i++) {
+        limiter.do();
+    }
+
+    t.equal(calls.length, 5);
+
+    calls.forEach(i => i.resolve());
+    await Promise.resolve();
+    t.equal(calls.length, 10);
+
+    calls.forEach(i => i.resolve());
+    await Promise.resolve();
+    t.equal(calls.length, 12);
+
+    t.end();
+});