checkUnchanged example

$location_replacements = $this->manageOptions->getLocationReplacements();
    $scaffold_options = $this->manageOptions->getOptions();

    // Create a collection of scaffolded files to process. This determines which     // take priority and which are combined.     $scaffold_files = new ScaffoldFileCollection($file_mappings, $location_replacements);

    // Get the scaffold files whose contents on disk match what we are about to     // write. We can remove these from consideration, as rewriting would be a     // no-op.     $unchanged = $scaffold_files->checkUnchanged();
    $scaffold_files->filterFiles($unchanged);

    // Process the list of scaffolded files.     $scaffold_results = $scaffold_files->processScaffoldFiles($this->io, $scaffold_options);

    // Generate an autoload file in the document root that includes the     // autoload.php file in the vendor directory, wherever that is. Drupal     // requires this in order to easily locate relocated vendor dirs.     $web_root = $this->manageOptions->getOptions()->getLocation('web-root');
    if (!GenerateAutoloadReferenceFile::autoloadFileCommitted($this->io, $this->rootPackageName(), $web_root)) {
      $scaffold_results[] = GenerateAutoloadReferenceFile::generateAutoload($this->io, $this->rootPackageName(), $web_root, $this->getVendorPath());
    }