src/Console/ConfigurationResolver.php
public function getProgress()
    {
        if (null === $this->progress) {
            if (OutputInterface::VERBOSITY_VERBOSE <= $this->options['verbosity'] && 'txt' === $this->getFormat()) {
                $progressType = $this->options['show-progress'];
                $progressTypes = ['none', 'run-in', 'estimating', 'estimating-max', 'dots'];

                if (null === $progressType) {
                    $default = 'run-in';

                    if (getenv('PHP_CS_FIXER_FUTURE_MODE')) {
                        $default = 'dots';
                    }

                    $progressType = $this->getConfig()->getHideProgress() ? 'none' : $default;
                } elseif (!\in_array($progressType, $progressTypes, true)) {
                    throw new InvalidConfigurationException(sprintf(
                        'The progress type "%s" is not defined, supported are "%s".',
                        $progressType,
                        implode('", "', $progressTypes)
                    ));
                } elseif (\in_array($progressType, ['estimating', 'estimating-max', 'run-in'], true)) {
                    $message = 'Passing `estimating`, `estimating-max` or `run-in` is deprecated and will not be supported in 3.0, use `none` or `dots` instead.';

                    if (getenv('PHP_CS_FIXER_FUTURE_MODE')) {
                        throw new \InvalidArgumentException("{$message} This check was performed as `PHP_CS_FIXER_FUTURE_MODE` env var is set.");
                    }

                    @trigger_error($message, E_USER_DEPRECATED);
                }

                $this->progress = $progressType;
            } else {
                $this->progress = 'none';
            }
        }

        return $this->progress;
    }
public function getProgress()
    {
        if (null === $this->progress) {
            if (OutputInterface::VERBOSITY_VERBOSE <= $this->options['verbosity'] && 'txt' === $this->getFormat()) {
                $progressType = $this->options['show-progress'];
                $progressTypes = ['none', 'run-in', 'estimating', 'estimating-max', 'dots'];

                if (null === $progressType) {
                    $default = 'run-in';

                    if (getenv('PHP_CS_FIXER_FUTURE_MODE')) {
                        $default = 'dots';
                    }

                    $progressType = $this->getConfig()->getHideProgress() ? 'none' : $default;
                } elseif (!\in_array($progressType, $progressTypes, true)) {
                    throw new InvalidConfigurationException(sprintf(
                        'The progress type "%s" is not defined, supported are "%s".',
                        $progressType,
                        implode('", "', $progressTypes)
                    ));
                } elseif (\in_array($progressType, ['estimating', 'estimating-max', 'run-in'], true)) {
                    $message = 'Passing `estimating`, `estimating-max` or `run-in` is deprecated and will not be supported in 3.0, use `none` or `dots` instead.';

                    if (getenv('PHP_CS_FIXER_FUTURE_MODE')) {
                        throw new \InvalidArgumentException("{$message} This check was performed as `PHP_CS_FIXER_FUTURE_MODE` env var is set.");
                    }

                    @trigger_error($message, E_USER_DEPRECATED);
                }

                $this->progress = $progressType;
            } else {
                $this->progress = 'none';
            }
        }

        return $this->progress;
    }
@throws InvalidConfigurationException

@return string