@babel/preset-env: `DEBUG` option

Using targets:
{
  "chrome": "60"
}

Using modules transform: commonjs

Using plugins:
  proposal-async-generator-functions { "chrome":"60" }
  syntax-object-rest-spread { "chrome":"60" }
  proposal-unicode-property-regex { "chrome":"60" }
  transform-dotall-regex { "chrome":"60" }
  proposal-optional-catch-binding { "chrome":"60" }

Using polyfills with `entry` option:

[src/in.js] Replaced `@babel/polyfill` with the following polyfills:
  es6.array.sort { "chrome":"60" }
  es7.object.define-getter { "chrome":"60" }
  es7.object.define-setter { "chrome":"60" }
  es7.object.lookup-getter { "chrome":"60" }
  es7.object.lookup-setter { "chrome":"60" }
  es7.promise.finally { "chrome":"60" }
  es7.symbol.async-iterator { "chrome":"60" }
  web.timers { "chrome":"60" }
  web.immediate { "chrome":"60" }
  web.dom.iterable { "chrome":"60" }
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