public function registerFilesets() {
    // @todo Assert that filesets from \Acquia\Blt\Custom\Filesets override
    // those from \Acquia\Blt\Custom\Filesets.
    $classes = [
      // @codingStandardsIgnoreStart
      \Acquia\Blt\Robo\Filesets\Filesets::class,
      \Acquia\Blt\Custom\Filesets::class,
      // @codingStandardsIgnoreEnd
    ];
    $fileset_annotations = $this->getAllFilesetAnnotations($classes);
    $filesets = $this->getFilesetsFromAnnotations($fileset_annotations);

    $this->filesets = $filesets;
  }