Since updating to RC.0, I'm getting the following build error to do with moment.js (which I have installed via npm):
[13:44:16] Error: Cannot call a namespace ('moment')
import * as moment from 'moment';
import moment from 'moment'
import * as Moment from 'moment'; I was getting the error: Cannot call a namespace ('Moment').
Changing it to
import Moment from 'moment'; resolved the issue.