function FetchError$6(message, type, systemError) {
  Error.call(this, message);

  this.message = message;
  this.type = type;

  // when err.type is `system`, err.code contains system error code
  if (systemError) {
    this.code = this.errno = systemError.code;
  }

  // hide custom error implementation details from end-users
  Error.captureStackTrace(this, this.constructor);
}
Create FetchError instance

@param   String      message      Error message for human
@param   String      type         Error type for machine
@param   String      systemError  For Node.js system error
@return  FetchError