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I wonder if they are using CoffeeScript anywhere at Facebook?

http://facebook.github.io/jest/docs/tutorial-coffeescript.ht...

We're not using CoffeeScript inside of Facebook. But we are using many ES6 features that make JS look a lot like CoffeeScript such as classes, arrow functions, rest arguments, destructuring assignment ... I figured that CoffeeScript would be a good example to show that Jest supports languages that transpile to JS :)

Curious - What are you using to transpile your ES6? Traceur?

Internally we use jstransform (github.com/facebook/jstransform) because it allows us to plug in individual transforms more easily. It's also what React uses for it's jsx transformations.

jstransform also ships with a few es6 features out of the box (classes, arrow functions, etc -- and the number is growing!), but Traceur definitely has more.

Actually our recent shortcuts-for-framer project happens to use CoffeeScript, but this is very much an outlier. https://github.com/facebook/shortcuts-for-framer

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