export function setupFrameResizeListener() {
  const previewFrame = getPreviewFrame();

  window.addEventListener('message', function (e) {
    const RESIZE_CODE = 'resize:';
    if (typeof e.data !== 'string' || !e.data.startsWith(RESIZE_CODE)) {
      return;
    }

    const data = JSON.parse(e.data.substring(RESIZE_CODE.length))
    previewFrame.style.height = data.height + 'px'
  });
}

export function getPreviewFrame() {
  return document.getElementById('preview_frame');
}