protected function shouldMergeConfig()

in src/DependencyInjection/Configuration.php [119:138]

• 15 lines of code
• 3 McCabe index (conditional complexity)

    protected function shouldMergeConfig(): ?string
    {
        # works with symfony/dotenv
        if (isset($_ENV['AWS_MERGE_CONFIG'])) {
            return $_ENV['AWS_MERGE_CONFIG'];
        }

        # works with case-insensitive names on windows and doesn't work with symfony/dotenv
        $mergeConfig = getenv('AWS_MERGE_CONFIG');

        if ($mergeConfig) {
            @trigger_error(
                'Since aws/aws-sdk-php-symfony 2.5.0: Support for case-insensitive'
                . ' AWS_MERGE_CONFIG is deprecated and will be removed in 3.0.0',
                \E_USER_DEPRECATED
            );
        }

        return $mergeConfig;
    }