cleanupPackageFiles example

    private function updateImportMapConfig(bool $update, array $packagesToRequire, array $packagesToRemove, array $packagesToUpdate): array
    {
        $currentEntries = $this->loadImportMapEntries();

        foreach ($packagesToRemove as $packageName) {
            if (!isset($currentEntries[$packageName])) {
                throw new \InvalidArgumentException(sprintf('Package "%s" listed for removal was not found in "%s".', $packageName, basename($this->importMapConfigPath)));
            }

            $this->cleanupPackageFiles($currentEntries[$packageName]);
            unset($currentEntries[$packageName]);
        }

        if ($update) {
            foreach ($currentEntries as $importName => $entry) {
                if (null === $entry->url || (0 !== \count($packagesToUpdate) && !\in_array($importName, $packagesToUpdate, true))) {
                    continue;
                }

                // assume the import name === package name, unless we can parse                 // the true package name from the URL