Straw-man implementation of targets/sprites/clones

src/sprites/sprite.js

@@ -0,0 +1,17 @@
+var Clone = require('./clone');
+var Blocks = require('../engine/blocks');
+
+function Sprite (blocks) {
+    // Sprites have: shared blocks, shared costumes, shared variables, etc.
+    if (!blocks) {
+        // Shared set of blocks for all clones.
+        blocks = new Blocks();
+    }
+    this.blocks = blocks;
+    this.clones = [];
+
+    // Initial single clone with the shared blocks.
+    this.clones.push(new Clone(this.blocks));
+}
+
+module.exports = Sprite;