@babel/preset-env: `DEBUG` option

Using targets:
{
  "chrome": "71"
}

Using modules transform: auto

Using plugins:
  syntax-async-generators { "chrome":"71" }
  syntax-object-rest-spread { "chrome":"71" }
  syntax-json-strings { "chrome":"71" }
  syntax-optional-catch-binding { "chrome":"71" }

Using polyfills with `entry` option:

[<CWD>/src/in.js] Replaced core-js entries with the following polyfills:
  es.array.unscopables.flat { "chrome":"71" }
  es.array.unscopables.flat-map { "chrome":"71" }
  es.object.from-entries { "chrome":"71" }
  web.immediate { "chrome":"71" }

[<CWD>/src/in.js] Based on your targets, regenerator-runtime import excluded.
Successfully compiled 1 file with Babel.