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That is a TypeScript decorator[0]. It's not a Real JavaScript Thing™ in the TC-39 sense, but you can use it if you're willing to put up with more build tools.

[0] http://blogs.msdn.com/b/typescript/archive/2015/04/30/announ...

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That's also a Javascript decorator. You can use it with Babel today if you pass in `{stage: 0}`.

https://github.com/wycats/javascript-decorators

http://babeljs.io/docs/usage/experimental/

Huh, wycats finally caved on the syntax, eh? Good to know.

Thanks for educating me!

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