How to hook into leaveConfirmation bar?

Hello,

On the new Polaris, it seems that it is encouraged to use s-link and s-button component to navigate between pages using the href attribute. I like this approach, but the issue is that I could not find a way to hook with the shopify.saveBar.leaveConfirmation().

As this is required to provide a good user experience, is there a way for the new Polaris to automatically call this on every navigation attempt, to ensure that merchants are not moved away if they have a dirty form?

Thanks.