ember-in-viewport/addon/utils/find-elem.js

Detect if an Ember View or Component is in the viewport @ 60FPS

export default function (context) {
  let elem;
  if (
    context.nodeType === Node.ELEMENT_NODE ||
    context.nodeType === Node.DOCUMENT_NODE ||
    context instanceof Window
  ) {
    elem = context;
  } else {
    elem = document.querySelector(context);
  }

  return elem;
}