text: // front-matter loader for mdx
  const matter = require('gray-matter')
  const stringifyObject = require('stringify-object')
  
  module.exports = async function (src) {
    const callback = this.async()
    const { content, data } = matter(src)
  
    const code = `export const frontMatter = ${stringifyObject(data)}
  
  ${content}
    `
    return callback(null, code)
  }
  