gistfile1.js

function getFrontMatter(file) {
  return new Promise((resolve, reject) => {
    readFile(join(__dirname, '../pages', file), (error, content) => {
      if (error) return reject(error);
      let doc = fm(content.toString())
      resolve(doc);
    });
  })
}

async function getAllPages() {
  return new Promise((resolve, reject) => {
    glob('**/*.md', { cwd: join(__dirname, '../pages') }, (err, files) => {
      if (err) return reject(err);

      const result = files.map(file => {
        let path = '/' + file.substr(0, file.lastIndexOf('.'));
        if (path === '/index') {
          path = '/';
        } else if (path.endsWith('/index')) {
          path = path.substr(0, path.lastIndexOf('/index'));
        }

        let data = await getFrontMatter(file);

        return { path, file, data }
      });

      resolve(result);
    })
  })
}