@babel/preset-env: `DEBUG` option

Using targets:
{
  "chrome": "55"
}

Using modules transform: commonjs

Using plugins:
  proposal-async-generator-functions { "chrome":"55" }
  proposal-object-rest-spread { "chrome":"55" }
  proposal-unicode-property-regex { "chrome":"55" }
  transform-dotall-regex { "chrome":"55" }

Using polyfills with `usage` option:

[<CWD>/src/in.js] Based on your code and targets, none were added.
🎉  Successfully compiled 1 file with Babel.
