webpro/DOMtastic

/**
 * @module Ready
 */

/**
 * Execute callback when `DOMContentLoaded` fires for `document`, or immediately if called afterwards.
 *
 * @param handler Callback to execute when initial DOM content is loaded.
 * @return {Object} The wrapped collection
 * @chainable
 * @example
 *     $(document).ready(callback);
 */

export const ready = function(handler) {
  if(/complete|loaded|interactive/.test(document.readyState) && document.body) {
    handler();
  } else {
    document.addEventListener('DOMContentLoaded', handler, false);
  }
  return this;
};