I know I made this recommendation, but unfortunately, we need to hold off on ES6 syntax for now. Please replace this line with the following: 

```js
// Once ES6 syntax is supported, replace the operations below with the following line:
// asyncStorage.setItem('draft index', [...draftIndex]);
var entries = [];
draftIndex.forEach(function(v, k, e) { 
  entries.push([ k, v ]);
});
asyncStorage.setItem('draft index', entries);
```

(including the comment lines)