Question: I had been previously using [Allan Hortle's JSX package](https://github.com/allanhortle/JSX) until I ran into an issue with how it handled syntax highlighting. I then noticed that there is an official package, [sublime-react](https://github.com/reactjs/sublime-react).

With Allan Hortle's package, he included a snippet in the `Preferences > Key Bindings – User` for enabling Emmet functionality that looks like this:

```
{
    "keys": ["tab"],
    "command": "expand_abbreviation_by_tab", 
    "context": [
        {
            "operand": "source.js.jsx", 
            "operator": "equal", 
            "match_all": true, 
            "key": "selector"
        }
    ]
}

```

This snippet doesn't appear to work with the official sublime-react package. It seems to be something to modify with the key bindings but an initial perusal of the Sublime documentation yielded no light on the subject. Help?

Answer: 
In April 2015 [Emmet added support for jsx](https://twitter.com/emmetio/status/583398878789132289), but it doesn't work by default. Well, for my surprise it was actually working with the `control + E` shortcut, but I wanted to use the `TAB` key to expand. Following the [official instructions](https://github.com/sergeche/emmet-sublime/blob/master/README.md#how-to-expand-abbreviations-with-tab-in-other-syntaxes) did the trick for me.

Basically, I had to paste the following inside my user key bindings file (
`Preferences` > `Key Bindings — User` ):

```
{ "keys": ["tab"], "command": "expand_abbreviation_by_tab", "context":
    [
        { "operand": "source.js", "operator": "equal", "match_all": true, "key": "selector" },
        { "match_all": true, "key": "selection_empty" },
        { "operator": "equal", "operand": false, "match_all": true, "key": "has_next_field" },
        { "operand": false, "operator": "equal", "match_all": true, "key": "auto_complete_visible" },
        { "match_all": true, "key": "is_abbreviation" }
    ]
}

```

This is the code without all the comments, and with the right `SCOPE_SELECTOR` in place.
If you type `shift+super+p` in a file it will let you see the current selection's context in the bottom left.

The first word is always the base file type. (`source.js`, `text.html`) In the case of the [JSX](https://github.com/allanhortle/JSX) I chose to change this to `source.js.jsx`. This is because before it is compiled JSX really isn't javascript, though it does look rather similar. There are plenty of completions and sublime sugar that you'd like to have happen in JSX but not JS. [sublime-react](https://github.com/reactjs/sublime-react) on the other hand uses plain old `source.js`. 

So this snippet you have is right you just need to replace `source.js.jsx` with `source.js`