KnpLabs / rad-resource-resolver

            return $this->normalizeArray($declaration);

        }

        if (isset($declaration['arguments']) && !is_array($declaration['arguments'])) {

            throw new \InvalidArgumentException('The "arguments" parameter should be an array of arguments.');

        }

        // Adds default value to associative array

        return array_merge(['method' => null, 'required' => true, 'arguments' => []], $declaration);

    private function normalizeArray($declaration)

    {

        if (isset($declaration[1]) && !is_array($declaration[1])) {

            throw new \InvalidArgumentException('The second argument for a resource configuration, when expressed with a numerically indexed array, should be an array of arguments.');

        }

        $service = $declaration[0];

        $method  = null;