Update src/virtual-machine.js

src/virtual-machine.js

@@ -19,6 +19,7 @@ const RenderedTarget = require('./sprites/rendered-target');
 const StageLayering = require('./engine/stage-layering');
 const Sprite = require('./sprites/sprite');
 const Blocks = require('./engine/blocks');
+const Comment = require('./engine/comment.js');
 const formatMessage = require('format-message');
 const ExtensionStorage = require('./util/deprecated-extension-storage.js');
 
@@ -257,6 +258,7 @@ class VirtualMachine extends EventEmitter {
             loadCostume,
             loadSound,
             Blocks,
+            Comment,
             StageLayering,
             Variable,
             Thread: require('./engine/thread.js'),
@@ -493,18 +495,25 @@ class VirtualMachine extends EventEmitter {
                     return resolve([json, sb1.zip]);
                 }
 
-                // if it isnt a zip, maby its the project.json in ArrayBuffer form
-                if (tag.slice(0, 2) !== 'PK') {
-                    const decoder = new TextDecoder('UTF-8');
-                    input = decoder.decode(input);
-                }
-                if (typeof input === 'string')
-                    input = JSON.parse(input);
+                if (typeof input === 'string') input = JSON.parse(input);
                 // generic objects return [object Object] on stringify
                 if (input.toString() === '[object Object]') {
                     input.projectVersion = this.isSB2(input) ? 2 : 3;
                     return resolve([input, null]);
                 }
+                if (tag.slice(0, 2) !== 'PK') {
+                    // if it isnt a zip, maby its the project.json in ArrayBuffer form
+                    const decoder = new TextDecoder('UTF-8');
+                    input = decoder.decode(input);
+
+                    if (typeof input === 'string') input = JSON.parse(input);
+                    // generic objects return [object Object] on stringify
+                    if (input.toString() === '[object Object]') {
+                        input.projectVersion = this.isSB2(input) ? 2 : 3;
+                        return resolve([input, null]);
+                    }
+                }
+
                 const zip = await JSZip.loadAsync(input);
                 const proj = zip.file('project.json');
                 if (!proj) return reject('No project.json file inside the given project');
@@ -570,6 +579,22 @@ class VirtualMachine extends EventEmitter {
         for (const file of Object.values(zip.files)) {
             file.date = date;
         }
+
+        // Tell JSZip to only compress file formats where there will be a significant gain.
+        const COMPRESSABLE_FORMATS = [
+            '.json',
+            '.svg',
+            '.wav',
+            '.ttf',
+            '.otf'
+        ];
+        for (const file of Object.values(zip.files)) {
+            if (COMPRESSABLE_FORMATS.some(ext => file.name.endsWith(ext))) {
+                file.options.compression = 'DEFLATE';
+            } else {
+                file.options.compression = 'STORE';
+            }
+        }
         return zip;
     }
 
@@ -1159,7 +1184,7 @@ class VirtualMachine extends EventEmitter {
      * @return {AudioBuffer} the sound's audio buffer.
      */
     getSoundBuffer (soundIndex) {
-        const id = this.editingTarget.sprite.sounds[soundIndex].soundId;
+        const id = this.editingTarget.sprite.sounds[soundIndex]?.soundId;
         if (id && this.runtime && this.runtime.audioEngine) {
             return this.editingTarget.sprite.soundBank.getSoundPlayer(id).buffer;
         }