public function hasExtension($extension)
    {
        if ($extension instanceof ExtensionInterface) {
            $extension = $extension->getName();
        }

        return $this->extensions->exists($extension);
    }
public function hasExtension($extension)
    {
        if ($extension instanceof ExtensionInterface) {
            $extension = $extension->getName();
        }

        return $this->extensions->exists($extension);
    }
@param string|object $extension

@return boolean