core-bundle/src/Config/Dumper/CombinedFileDumper.php
public function dump($files, $cacheFile, array $options = []): void
    {
        $buffer = $this->header;
        $type = $options['type'] ?? null;

        foreach ((array) $files as $file) {
            $buffer .= $this->loader->load($file, $type);
        }

        $this->filesystem->dumpFile($this->cacheDir.'/'.$cacheFile, $buffer);
    }
public function dump($files, $cacheFile, array $options = []): void
    {
        $buffer = $this->header;
        $type = $options['type'] ?? null;

        foreach ((array) $files as $file) {
            $buffer .= $this->loader->load($file, $type);
        }

        $this->filesystem->dumpFile($this->cacheDir.'/'.$cacheFile, $buffer);
    }
{@inheritdoc}