How to use the @storybook/core-events.STORY_INIT function in @storybook/core-events

setPath({ storyId, viewMode });
    });

    // Handle keyboard shortcuts
    window.onkeydown = event => {
      if (!focusInInput(event)) {
        // We have to pick off the keys of the event that we need on the other side
        const { altKey, ctrlKey, metaKey, shiftKey, key, code, keyCode } = event;
        channel.emit(Events.PREVIEW_KEYDOWN, {
          event: { altKey, ctrlKey, metaKey, shiftKey, key, code, keyCode },
        });
      }
    };
  }

  storyStore.on(Events.STORY_INIT, () => {
    const { storyId, viewMode } = initializePath();
    storyStore.setSelection({ storyId, viewMode });
  });

  storyStore.on(Events.STORY_RENDER, renderUI);

  if (typeof window !== 'undefined') {
    window.__STORYBOOK_CLIENT_API__ = clientApi;
    window.__STORYBOOK_ADDONS_CHANNEL__ = channel; // may not be defined
  }

  let previousExports = {};
  const loadStories = req => () => {
    req.keys().forEach(filename => {
      const fileExports = req(filename);

_renderMain() {
    // do initial render of story
    this._storyStore.emit(Events.STORY_INIT);
  }