Document ES7 configuration with babel for ava

The documentation includes information on how to get ES6 support for ava, which is great. Would it be possible to include docs on how to get ES7 in also?

Here's a realistic use case:

A React component with the @connect() decorator from Redux:

import React from 'react';
import { connect } from 'react-redux';

@connect()
class Foo extends React.Component {

}

A test file for unit testing it:

import test from 'ava';
import { isElementOfType } from 'react-addons-test-utils';
import 'babel-core/register'; // as per docs

var Foo = require('../src/foo.jsx');

test('foo ', t => {
  const simpleFoo = React.createElement(Foo);
  t.ok(isElementOfType(Foo, simpleFoo));
});

I tried using a shim that apparently worked for people back when iojs was separate, but the namespaces don't match anymore:

require("babel/register")({
  optional: ['es7.asyncFunctions']
});

On the other hand, this guy claims ava supports es7 without any extra effort.

Either way, it would be nice to get some documentation on this--I'm interested in using ava going forward.

This didn't work either:

require("babel-register")({
  optional: ["es7.decorators"]
});

[Whoaa512]

AVA used to implicitly read in your local .babelrc file before 0.10 (See #398) which would allow you to use es7 or any arbitrary babel plugins.

See #448 to contribute to the discussion on how customizable babel options should be handled.

[sindresorhus]

Yes, we need to resolve this soon. We need more feedback on #448 ;)

[novemberborn]

Closing this in favor of #448, under the assumption that the implementation would be obvious once that lands.