add async/await

Author: jonathanong

lib/recast.json

@@ -106,5 +106,11 @@
   {
     "module": "regexpu",
     "shortName": "rgxu"
+  },
+  {
+    "module": "es7-async-fn",
+    "shortName": "async",
+    "runtime": "es7-async-fn/runtime.js",
+    "sources": []
   }
 ]

package.json

@@ -30,6 +30,7 @@
     "es6-rest-params": "0",
     "es6-spread": "0",
     "es6-templates": "0",
+    "es7-async-fn": "1",
     "istanbul": "0",
     "mocha": "2",
     "postcss": "3",

test/index.js

@@ -160,6 +160,14 @@ describe('Recast', function () {
       new Function(runtime)
     })
   })
+
+  describe('Async Functions', function () {
+    it('.runtime', function () {
+      var asyncFn = db.recast.transform.async
+      var runtime = asyncFn.runtime
+      new Function(runtime)
+    })
+  })
 })
 
 describe('PostCSS', function () {