Async function will be hoisted above some imports

...but it's still below `exports.foo = undefined;`, so the test is intact

packages/babel-plugin-transform-async-to-generator/test/fixtures/export-async/import-and-export/expected.js

@@ -5,13 +5,13 @@ Object.defineProperty(exports, "__esModule", {
 });
 exports.foo = undefined;
 
-var _bar = require('bar');
-
-var _bar2 = babelHelpers.interopRequireDefault(_bar);
-
 let foo = exports.foo = function () {
   var ref = babelHelpers.asyncToGenerator(function* () {});
   return function foo() {
     return ref.apply(this, arguments);
   };
 }();
+
+var _bar = require('bar');
+
+var _bar2 = babelHelpers.interopRequireDefault(_bar);