Can I use Angular libraries, for example angular-cookies in Angular 2 app? Seems that this is not possible, but I want to know this cause I'm planning to upgrade project to Angular2
In general, no. If you're interested in following the migration guide by running Angular 1 and 2 simultaneously, you may be able to get an Angular 1 library functioning, but it's likely not worth your trouble.
I'd encourage you not to be scared of rewriting common libraries for yourself. You'll be surprised by how easy it is - in many instances you'd spend more time trying to figure out a library's documentation, and you gain an intimate understanding of the code.
来源：https://stackoverflow.com/questions/35436914/using-angular-1-libraries-in-angular-2