private function parseImports($content)
    {
        if (!isset($content['imports'])) {
            return [];
        }

        if (!is_array($content['imports'])) {
            throw new InvalidArgumentException(sprintf('The "imports" key should contain an array in %s. Check your YAML syntax.', $this->fileName));
        }

        $additionalDefinitions = [];

        foreach ($content['imports'] as $import) {
            if (!is_array($import)) {
                throw new InvalidArgumentException(sprintf('The values in the "imports" key should be arrays in %s. Check your YAML syntax.', $this->fileName));
            }

            if (isset($import['ignore_errors'])) {
                throw new InvalidArgumentException(sprintf('The "ignore_errors" key is not supported in YamlDefinitionLoader. This is a Symfony specific syntax. Check your YAML syntax.', $this->fileName));
            }

            $importFileName = $import['resource'];

            if (strpos($importFileName, '/') !== 0) {
                $importFileName = dirname($this->fileName).'/'.$importFileName;
            }

            $yamlDefinitionLoader = new self($importFileName);
            $newDefinitions = $yamlDefinitionLoader->getDefinitions();

            $additionalDefinitions = $newDefinitions + $additionalDefinitions;
        }

        return $additionalDefinitions;
    }