vartheme_bs5-2.0.x-dev/src/helpers/checkDocumentIsReady.js

export const checkDocumentIsReady = (fn) => {
  // see if DOM is already available
  if (document.readyState === "complete" || document.readyState === "interactive") {
      // call on next available tick
      setTimeout(fn, 1);
  } else {
      document.addEventListener("DOMContentLoaded", fn);
  }
}