'use strict';

setupResizeListener();

///

function setupResizeListener() {
  const RESIZE_CODE = 'resize:';

  const resizeObserver = new ResizeObserver(entries => {
    const height = document.body.offsetHeight;
    window.parent.postMessage(RESIZE_CODE + JSON.stringify({height}), '*');
  })

  resizeObserver.observe(document.body);
}