Emmet expansions and className in React JSX

Since I wrote Sublime Text Power User and recently released React for Beginners - one of the questions I get most often is how do I use Emmet shortcuts right inside of my JSX?

There are lots of tricks out there, but this is the proper way to get everything setup without any hacks.

Grab the snippet code from https://gist.github.com/wesbos/2bb4a6998635df97c748

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