public function rewriteRelativeImports (Asset $asset, string $fileContent) : string
    {
        $importParser = new CssUrlImportParser();
        return $importParser->replaceValidImports(
            $fileContent,
            function (string $path) use ($asset)
            {
                return $this->rewritePathInStaticImport($asset, $path);
            }
        );
    }