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/src/compiler/environment.js

@@ -0,0 +1,20 @@
+/* eslint-disable no-eval */
+
+/**
+ * @returns {boolean} true if the nullish coalescing operator (x ?? y) is supported.
+ * See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing_operator
+ */
+const supportsNullishCoalescing = () => {
+    try {
+        // eslint-disable-next-line no-unused-vars
+        const fn = new Function('undefined ?? 3');
+        // if function construction succeeds, the browser understood the syntax.
+        return true;
+    } catch (e) {
+        return false;
+    }
+};
+
+module.exports = {
+    supportsNullishCoalescing: supportsNullishCoalescing()
+};