Basically in angular-permission you define different validations the current session can pass or not. We are for now calling these 'roles' but im sure that's not the correct word to describe them.

To give you a better example, let's say we have a Session service which handles wether we are logged in or not, also stores information about the user currently logged in. We can define the following 'roles':

'anonymous' -> Session.currentUser is undefined 'admin' -> Session.currentUser.isAdmin is true 'user' -> Session.currentUser is defined

A common use-case would be not allowing the user to enter the signup and login view if we are already logged in. So to do that we would add in the login state a data.permissions object something like this:

permissions: { except: ['anonymous'] redirectTo: 'home' }

This is a fairly common use case of to what a library like this can be useful. Keep in mind it's still in early stage but we're currently using it in a fairly big project and it's saved us tons of lines of code.