Is there a theme agnostic way to open cart drawer?

[jmattiace]

I have a theme extension app that allows users to add products to the cart via the AJAX API. How can I open the cart drawer across all themes after successful AJAX call? 

[jmattiace]

@Talok_klot thank you for the detailed response! However, I should have clarified that I am the developer of the theme extension app which gets embedded on any number of Shopify themes, so I am looking for a way to do this without having to have knowledge of any theme-specific cart behavior.