@beisen/storybook-react/src/client/preview/globals.js

Storybook for React: Develop React Component in isolation with Hot Reloading.

import { window } from 'global';

if (window && window.parent !== window) {
  try {
    // eslint-disable-next-line no-underscore-dangle
    window.__REACT_DEVTOOLS_GLOBAL_HOOK__ = window.parent.__REACT_DEVTOOLS_GLOBAL_HOOK__;
  } catch (error) {
    // The above line can throw if we do not have access to the parent frame -- i.e. cross origin
  }
}

if (window) {
  window.STORYBOOK_ENV = 'react';
}