babel-preset-es2015 minus regenerator plus async-to-module-method.
$ npm install --save-dev babel-preset-es2015-generators-async
.babelrc
{
"presets": ["es2015-generators-async"]
}
$ babel script.js --presets es2015-generators-async
require("babel-core").transform("code", {
presets: ["es2015-generators-async"]
});