The "hide.bs.modal" event occurs modal is about to be hidden.

document.querySelector("#MODAL_ID").addEventListener(

  'hide.bs.modal', ()=>console.log("Modal starts hide procces")

);

​

The "hidden.bs.modal" triggers after "hide" event is done

document.querySelector("#MODAL_ID").addEventListener(

  'hidden.bs.modal', ()=>console.log("Modal is now hidden")

);

​