Question

export function getClientHeight() {
  let clientHeight = 0;
  if (document.body.clientHeight && document.documentElement.clientHeight) {
    clientHeight = (document.body.clientHeight < document.documentElement.clientHeight) ? document.body.clientHeight : document.documentElement.clientHeight;
  }
  else {
    clientHeight = (document.body.clientHeight > document.documentElement.clientHeight) ? document.body.clientHeight : document.documentElement.clientHeight;
  }
  return clientHeight;
}