How to do something in ionBackdropTap event?

I want to add a class to the ion-nav when i click on ion-backdrop.

Right now when sidemenu opens the ion-backdrop is appearing and when click on it its disappearing,
I have found that when we tap on ion-backdrop . ionBackdropTap event usually fired. But unable to find this.

Please can anybody put a light on it ?

Thank you

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