src/Retry/ConfigurationProvider.php [58:89]:
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    protected static $interfaceClass = ConfigurationInterface::class;
    protected static $exceptionClass = ConfigurationException::class;

    /**
     * Create a default config provider that first checks for environment
     * variables, then checks for a specified profile in the environment-defined
     * config file location (env variable is 'AWS_CONFIG_FILE', file location
     * defaults to ~/.aws/config), then checks for the "default" profile in the
     * environment-defined config file location, and failing those uses a default
     * fallback set of configuration options.
     *
     * This provider is automatically wrapped in a memoize function that caches
     * previously provided config options.
     *
     * @param array $config
     *
     * @return callable
     */
    public static function defaultProvider(array $config = [])
    {
        $configProviders = [self::env()];
        if (
            !isset($config['use_aws_shared_config_files'])
            || $config['use_aws_shared_config_files'] != false
        ) {
            $configProviders[] = self::ini();
        }
        $configProviders[] = self::fallback();

        $memo = self::memoize(
            call_user_func_array([ConfigurationProvider::class, 'chain'], $configProviders)
        );
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src/S3/RegionalEndpoint/ConfigurationProvider.php [53:84]:
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    protected static $interfaceClass = ConfigurationInterface::class;
    protected static $exceptionClass = ConfigurationException::class;

    /**
     * Create a default config provider that first checks for environment
     * variables, then checks for a specified profile in the environment-defined
     * config file location (env variable is 'AWS_CONFIG_FILE', file location
     * defaults to ~/.aws/config), then checks for the "default" profile in the
     * environment-defined config file location, and failing those uses a default
     * fallback set of configuration options.
     *
     * This provider is automatically wrapped in a memoize function that caches
     * previously provided config options.
     *
     * @param array $config
     *
     * @return callable
     */
    public static function defaultProvider(array $config = [])
    {
        $configProviders = [self::env()];
        if (
            !isset($config['use_aws_shared_config_files'])
            || $config['use_aws_shared_config_files'] != false
        ) {
            $configProviders[] = self::ini();
        }
        $configProviders[] = self::fallback();

        $memo = self::memoize(
            call_user_func_array([ConfigurationProvider::class, 'chain'], $configProviders)
        );
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