src/Mapper/FileSystem/FileSystemMapper.php
protected function read($namespace)
    {
        $file = $this->adapter->getFileName($namespace);
        if (!$this->fileSystem->has($file)) {
            return [];
        }

        return $this->adapter->onRead($this->fileSystem->read($file));
    }
protected function read($namespace)
    {
        $file = $this->adapter->getFileName($namespace);
        if (!$this->fileSystem->has($file)) {
            return [];
        }

        return $this->adapter->onRead($this->fileSystem->read($file));
    }
Reads settings content of a namespace

@param  string $namespace
@return array