Revisited: Creating An Event-Driven Pre-Bootstrap Loading Screen In Angular 2.0.0

Earlier this week, I revisited the idea of creating a pre-bootstrap loading screen in Angular 2 (which was, itself, a revisiting of an earlier post). In that post, I used the Document Object Model (DOM) as a means to cross the application boundary, allowing the app to announce an "appready" event to the host page, which was managing the pre-bootstrap loading screen.