css/modules/primer-navigation/stories.js

import React from 'react'
import { storiesOf } from '@storybook/react'
import storiesFromMarkdown from '../../.storybook/lib/storiesFromMarkdown'

const stories = storiesOf('Navigation', module)

storiesFromMarkdown(require.context('.', true, /\.md$/))
  .forEach(({title, story}) => {
    stories.add(title, story)
  })