Craft\MinimeeService::minifyAsset PHP Method

    protected function minifyAsset($asset)
    {
        craft()->config->maxPowerCaptain();
        $contents = $asset->contents;
        switch ($this->type) {
            case MinimeeType::Js:
                $contents = $this->minifyJsAsset($asset);
                break;
            case MinimeeType::Css:
                $contents = $this->minifyCssAsset($asset);
                break;
        }
        return $contents;
    }