code: function getResultSeverity (result, config) {
    // Count all errors
    return result.reduce((previous, message) => {
      let severity
  
      if (message.fatal) {
        return previous + 1
      }
  
      severity = message.messages[0] ? message.messages[0].severity : 0
  
      if (severity === 2) {
        return previous + 1
      }
  
      return previous
    }, 0)
  }
docs: Calculates the severity of a eslint.linter.verify result
  @param {Array} result Eslint verify result array
  @param {Object} config Eslint eslint/lib/config
  @return {Number} If the returned number is greater than 0 the result contains errors.