Now that with v3.x my app is breaking since it's browserify + babelify configuration doesn't transform node_modules by default.

See https://github.com/babel/babelify#faq for background.

Suggestion is to add this in your package.json

{
  "browserify": {
    "transform": [["babelify", { "presets": ["@babel/preset-env"] }]]
  }
}

This will ensure that any app using async and building it with browserify + babelify gets transpiled correctly.

Thanks!