_getFileInfos(files, intoDir, templateVariables, options) {
    return files
      .map((file) => this.buildFileInfo.call(this, intoDir, templateVariables, file, options))
      .filter(Boolean);
  }
@private
    @method _getFileInfos
    @param {Array} files
    @param {String} intoDir
    @param {Object} templateVariables
    @param {Object} options
    @return {Array} file infos