stop closing the modal by clicking backdrop or outside the modal

As per the answer of @anshuVersatile, I understand we need to use some modal options.

Then I create a object of NgbModalOptions and pass it as second parameter of my open method and it works.

Code is as follows :

let ngbModalOptions: NgbModalOptions = {
      backdrop : 'static',
      keyboard : false
};
console.log(ngbModalOptions);
const modalRef = this.modalService.open(NgbdModalContent, ngbModalOptions);

Here is the updated plunker.