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/integration/offline-custom-assets.js

@@ -0,0 +1,77 @@
+/**
+ * @fileoverview
+ * This integration test ensures that a local upload of a sb2 project pulls
+ * in assets correctly (from the provided .sb2 file) even if the assets
+ * are not present on our servers.
+ */
+const path = require('path');
+const fs = require('fs');
+const test = require('tap').test;
+const AdmZip = require('adm-zip');
+const ScratchStorage = require('scratch-storage');
+const VirtualMachine = require('../../src/index');
+
+const projectUri = path.resolve(__dirname, '../fixtures/offline-custom-assets.sb2');
+const projectZip = AdmZip(projectUri);
+const project = Buffer.from(fs.readFileSync(projectUri));
+// Custom costume from sb2 file (which was downloaded from offline editor)
+// This sound should not be available on our servers
+const costume = projectZip.readFile('1.svg');
+const costumeData = new Uint8Array(costume);
+// Custom sound recording from sb2 file (which was downloaded from offline editor)
+// This sound should not be available on our servers
+const sound = projectZip.readFile('0.wav');
+const soundData = new Uint8Array(sound);
+
+test('offline-custom-assets', t => {
+    const vm = new VirtualMachine();
+    // Use a test storage here that does not have any web sources added to it.
+    const testStorage = new ScratchStorage();
+    vm.attachStorage(testStorage);
+
+    // Evaluate playground data and exit
+    vm.on('playgroundData', e => {
+        const threads = JSON.parse(e.threads);
+        t.ok(threads.length === 0);
+        vm.quit();
+        t.end();
+    });
+
+    // Start VM, load project, and run
+    t.doesNotThrow(() => {
+        vm.start();
+        vm.clear();
+        vm.setCompatibilityMode(false);
+        vm.setTurboMode(false);
+        vm.loadProject(project).then(() => {
+
+            // Verify initial state
+            t.equals(vm.runtime.targets.length, 2);
+            const costumes = vm.runtime.targets[1].getCostumes();
+            t.equals(costumes.length, 1);
+            const customCostume = costumes[0];
+            t.equals(customCostume.name, 'A_Test_Costume');
+
+            const storedCostume = customCostume.asset;
+            t.type(storedCostume, 'object');
+            t.deepEquals(storedCostume.data, costumeData);
+
+            const sounds = vm.runtime.targets[1].sprite.sounds;
+            t.equals(sounds.length, 1);
+            const customSound = sounds[0];
+            t.equals(customSound.name, 'A_Test_Recording');
+            const storedSound = customSound.asset;
+            t.type(storedSound, 'object');
+            t.deepEquals(storedSound.data, soundData);
+
+            vm.greenFlag();
+
+            // After two seconds, get playground data and stop
+            setTimeout(() => {
+                vm.getPlaygroundData();
+                vm.stopAll();
+            }, 2000);
+        });
+    });
+
+});