storybook/examples/html-kitchen-sink/.storybook/config.js

import { configure } from '@storybook/html';
import { setOptions } from '@storybook/addon-options';

setOptions({
  hierarchyRootSeparator: /\|/,
});

// automatically import all files ending in *.stories.js
const req = require.context('../stories', true, /.stories.js$/);
function loadStories() {
  // Make welcome story default
  require('../stories/index.stories');
  req.keys().forEach(filename => req(filename));
}

configure(loadStories, module);