I ended up using the bundles
option which in my case looks like this
bundles:
{
'ember-simple-auth': ['ember-simple-auth/core','ember-simple-auth/session','ember-simple-auth/authenticators','ember-simple-auth/authorizers','ember-simple-auth/stores','ember-simple-auth/utils','ember-simple-auth/mixins/application_route_mixin','ember-simple-auth/mixins/authenticated_route_mixin','ember-simple-auth/mixins/authentication_route_mixin','ember-simple-auth/mixins/authentication_controller_mixin','ember-simple-auth/mixins/login_controller_mixin','ember-simple-auth/authenticators/base','ember-simple-auth/authorizers/base','ember-simple-auth/stores/base','ember-simple-auth/stores/local_storage','ember-simple-auth/stores/ephemeral','ember-simple-auth/utils/flat_objects_are_equal','ember-simple-auth/utils/is_secure_url']
},