code: function readFile(path, fileName) {
    return new Promise((resolve, reject) => {
      fs.readFile(`${path}/${fileName}`, 'utf8', (err, content) => {
        if (err) {
          return reject(err)
        }
  
        return resolve(content)
      })
    })
  }
docs: readFile fs promise wrapped
  @param {string} path
  @param {string} fileName