lib/core-client/src/manager/index.ts
import global from 'global';
import renderStorybookUI from '@storybook/ui';
import Provider from './provider';
import { importPolyfills } from './conditional-polyfills';
const { document } = global;
importPolyfills().then(() => {
const rootEl = document.getElementById('root');
renderStorybookUI(rootEl, new Provider());
});