code: public function getConnectionConfig($connection = null)
  	{
  		if ($connection === null) {
  			$connection = $this->defaultConnection;
  		}
  
  		$config = $this->config->get("database.connections.$connection");
  
  		if (!$config) {
  			if (!is_string($connection)) {
  				$connection = gettype($connection);
  			}
  
  			throw new \InvalidArgumentException("No config found for connection: $connection");
  		}
  
  		return $config;
  	}
docs: Get the configuration array for a specific connection.
  
  @param  string $connection The name of the connection.
  
  @return array
  
  @throws \InvalidArgumentException If connection is not defined