`ResizeObserverMock`

Mock-implementation of ResizeObserver with ability of simulating resize programmatically.

Basic usage

import { ResizeObserverMock } from '@krutoo/utils/testing';

// creating like normal ResizeObserver
const observer = new ResizeObserverMock(callback);

// using like normal ResizeObserver
observer.observe(element);
observer.unobserve(element);
observer.disconnect(element);

// somewhere in your tests
observer.simulateResize([
  // all entry properties except `target` is optional
  // properties that is not provided will be filled by mocks
  {
    target: document.querySelector('#my-widget'),
  },
]);