This isn’t even standardized yet; it’s not part of ES2015 or ES2016, though support has started appearing in browsers.

An[old pull request](https://github.com/jashkenas/coffeescript/pull/3757) basically implements this feature exactly as we’ve outlined it below, though the PR needs updating to remove ES5 shims.

`async`/`await` isn’t completely standardized yet; it’s not part of ES2015 or ES2016, though support has started appearing in browsers.[It has reached Stage 4 of ES2017](https://github.com/tc39/proposals/blob/master/finished-proposals.md).

CoffeeScript’s version would add only the`await` keyword, which would automatically cause CoffeeScript to output an`async` keyword where needed. This behavior is similar to how generators are handled, where the presence of a`yield` keyword causes CoffeeScript to declare the function as`function*`: the presence of`await` would cause CoffeeScript to declare its associated function with`async`.