Currently, the ApplicationRef.bootstrap function (link) has a different (more limited) set of arguments and we can extend it to support directives and bindings in a way similar to the createComponent function (link). For symmetry, it'd be great to have the ApplicationRef.bootstrap function take 2 arguments:

• Component (or component factory for backwards compatibility) as the first argument
• Config object (similar to createComponent, but more limited) as the second argument

The tricky part would be to support the second argument in the proposed shape, since currently the second argument of the ApplicationRef.bootstrap function might be an object as well. This might require a breaking change and a migration.