Use ESModules instead of module.exports

[iva2k]

Using ulog in Angular triggers this warning:

Warning: .\src\app\app.module.ts depends on 'ulog'. CommonJS or AMD dependencies can cause optimization bailouts.
For more info see: https://angular.io/guide/build#configuring-commonjs-dependencies

'debug' seems to be adding ESModules to v5

debug-js/debug#786

[Download]

I'd be open to it. If you can provide guidance on how to do it, please consider opening a PR with a proof of concept.