New Toast.isShown() method

Created by: khalyomede

Prerequisites

• I have searched for duplicate or closed feature requests
• I have read the contributing guidelines

Proposal

import { Toast } from "bootstrap";

const element = document.getElementById("toast");

if (element instanceof HTMLElement) {
  const toast = new Toast(element);

  // Before
  if (!element.classList.contains("show")) {
    toast.show();
  }

  // after
  if (!toast.isShown()) {
    toast.show();
  }
}

Motivation and context

I would like to prevent the user to see new animation of the toast if he clicks multiple time to show the same toast.

I do not know how to import the "CLASS_NAME_SHOW" (https://github.com/twbs/bootstrap/blob/main/js/src/toast.js#L32) constant, and it feels like this is not safe to rely on the "show" class name.

On the other hand, having a Toast.isShown() method would ensure future major upgrade can safely change the "show" class name without affecting the end-developper result (supposing the documentation clearly enforce to use Toast.isShown()).