code: func (s *MigrationService) LargeFiles(ctx context.Context, owner, repo string) ([]*LargeFile, *Response, error) {
  	u := fmt.Sprintf("repos/%v/%v/import/large_files", owner, repo)
  	req, err := s.client.NewRequest("GET", u, nil)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	// TODO: remove custom Accept header when this API fully launches
  	req.Header.Set("Accept", mediaTypeImportPreview)
  
  	var files []*LargeFile
  	resp, err := s.client.Do(ctx, req, &files)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return files, resp, nil
  }
docs: // LargeFiles lists files larger than 100MB found during the import.
  //
  // GitHub API docs: https://developer.github.com/v3/migration/source_imports/#get-large-files