getReactReduxStore.js

/**
 * @param {Number} maxTries - max tries polling for store
 * @return {Promise<Redux.Store>} store
 *
 * @example
 * (async function() {
 *   const store = await window.getReactReduxStore();
 *   store.subscribe(() => {
 *     console.log('store updated =>', store);
 *   });
 * })();
 */
window.getReactReduxStore = (maxTries = 0) =>
  new Promise((resolve, reject) => {
    const root = document.querySelector('#root > div');
    let tryCount = 0;
    const interval = setTimeout(() => {
      const { store } = ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
        .ReactDOMComponentTree
        .getInstanceFromNode(root)
        .child
        .stateNode
        .context;
      tryCount++;
      
      if (store) {
        clearInterval(interval);
        return resolve(store);
      }
      
      if (tryCount >= maxTries)
        reject(new Error('exceeded max tries'));
    }, 50);
  });