code: protected function createConfigurationDefinition()
      {
          return new FixerConfigurationResolver([
              (new FixerOptionBuilder('default', 'Default fix strategy.'))
                  ->setDefault(self::SINGLE_SPACE)
                  ->setAllowedValues(self::$allowedValues)
                  ->getOption(),
              (new FixerOptionBuilder('operators', 'Dictionary of `binary operator` => `fix strategy` values that differ from the default strategy.'))
                  ->setAllowedTypes(['array'])
                  ->setAllowedValues([static function ($option) {
                      foreach ($option as $operator => $value) {
                          if (!\in_array($operator, self::$supportedOperators, true)) {
                              throw new InvalidOptionsException(
                                  sprintf(
                                      'Unexpected "operators" key, expected any of "%s", got "%s".',
                                      implode('", "', self::$supportedOperators),
                                      \is_object($operator) ? \get_class($operator) : \gettype($operator).'#'.$operator
                                  )
                              );
                          }
  
                          if (!\in_array($value, self::$allowedValues, true)) {
                              throw new InvalidOptionsException(
                                  sprintf(
                                      'Unexpected value for operator "%s", expected any of "%s", got "%s".',
                                      $operator,
                                      implode('", "', self::$allowedValues),
                                      \is_object($value) ? \get_class($value) : (null === $value ? 'null' : \gettype($value).'#'.$value)
                                  )
                              );
                          }
                      }
  
                      return true;
                  }])
                  ->setDefault([])
                  ->getOption(),
              // add deprecated options as BC layer
              (new FixerOptionBuilder('align_double_arrow', 'Whether to apply, remove or ignore double arrows alignment.'))
                  ->setDefault(false)
                  ->setAllowedValues([true, false, null])
                  ->setDeprecationMessage('Use options `operators` and `default` instead.')
                  ->getOption(),
              (new FixerOptionBuilder('align_equals', 'Whether to apply, remove or ignore equals alignment.'))
                  ->setDefault(false)
                  ->setAllowedValues([true, false, null])
                  ->setDeprecationMessage('Use options `operators` and `default` instead.')
                  ->getOption(),
          ]);
      }
docs: {@inheritdoc}