Conducting operations with steps and moving in phases. Simple, not using "upper-level" packages or imported structures. Real usage demands building extra lib, that imports opera, and handles io activities, renders common libraries, control flow aso. Customer / user data should be in separate files. Presentation in browser could be done with AngularDart.
A simple usage example (just for Dart sample, lol):
import 'package:opera/opera.dart';
main() {
var awesome = new Awesome();
}
Please file feature requests and bugs at the issue tracker.