modal-example-keyboard.html

<button class="btn btn-primary" (click)="defaultModal.show()">Default Behavior</button>
<ng-template nzbModal #defaultModal="nzbModal">
  <!-- same as data-keyboard="true" -->
  <div class="modal fade" tabindex="-1">...</div>
</ng-template>

<button class="btn btn-primary" (click)="noEscModal.show()">Keyboard = false</button>
<ng-template nzbModal #noEscModal="nzbModal">
  <div class="modal fade" tabindex="-1" data-keyboard="false">...</div>
</ng-template>