samMeow

import React from 'react';
import ReactDOM from 'react-dom';

let shouldRender = false;
const Children = () => {
    if (shouldRender) {
        return (<div>Hello world</div>);
    }
    throw new Promise((resolve) => {
        setTimeout(() => {

samMeow

const elementExistPromise = (selectorFunc, parent = document.body) => {
  const exists = selectorFunc(parent);
  if (exists && exists.length !== 0) {
    return Promise.resolve(exists);
  }
  return new Promise(resolve => {
    const mu = new MutationObserver((list, me) => {
      const record = list.find(({ target }) => {
        const x = selectorFunc(target);
        return x && x.length !== 0;