@babel/preset-env: `DEBUG` option

Using targets:
{
  "node": "6"
}

Using modules transform: commonjs

Using plugins:
  transform-function-name { "node":"6" }
  transform-for-of { "node":"6" }
  transform-destructuring { "node":"6" }
  transform-exponentiation-operator { "node":"6" }
  transform-async-to-generator { "node":"6" }
  proposal-async-generator-functions { "node":"6" }
  proposal-object-rest-spread { "node":"6" }
  proposal-unicode-property-regex { "node":"6" }
  transform-dotall-regex { "node":"6" }

Using polyfills with `entry` option:

[<CWD>/src/in.js] `import '@babel/polyfill'` was not found.
🎉  Successfully compiled 1 file with Babel.
