jtBaseApp/node_modules/@esri/calcite-components/dist/collection/utils/conditionalSlot.js

/*!
 * All material copyright ESRI, All Rights Reserved, unless otherwise specified.
 * See https://github.com/Esri/calcite-components/blob/master/LICENSE.md for details.
 * v1.0.0-beta.82
 */
import { forceUpdate } from "@stencil/core";
import { createObserver } from "./observers";
const observed = new Set();
let mutationObserver;
const observerOptions = { childList: true };
/**
 * Helper to set up a conditional slot component on connectedCallback.
 */
export function connectConditionalSlotComponent(component) {
  if (!mutationObserver) {
    mutationObserver = createObserver("mutation", processMutations);
  }
  mutationObserver.observe(component.el, observerOptions);
}
/**
 * Helper to tear down a conditional slot component on disconnectedCallback.
 */
export function disconnectConditionalSlotComponent(component) {
  observed.delete(component.el);
  // we explicitly process queued mutations and disconnect and reconnect
  // the observer until MutationObserver gets an `unobserve` method
  // see https://github.com/whatwg/dom/issues/126
  processMutations(mutationObserver.takeRecords());
  mutationObserver.disconnect();
  for (const [element] of observed.entries()) {
    mutationObserver.observe(element, observerOptions);
  }
}
function processMutations(mutations) {
  mutations.forEach(({ target }) => {
    forceUpdate(target);
  });
}