Image background stopped working after upgrading to RC.0

Ionic Framework ionic-v3
1

I used to have css rules such as the following in my page scss file.

{code}
ion-content {
background-image: url(’…/…/assets/bg.jpg’);
}
{code}

folder is src/assets/

after upgrading to RC.0, this stopped working. What’s the correct way to refer to assets?

2 
../assets/bg.jpg

works