function readFileList

Source

readFileList(value) {
  if (value == null) return null;
  var files = [];
  bool error;
  if (value is List) {
    files = value;
    error = value.any((e) => e is! String);
  } else if (value is String) {
    files = [value];
    error = false;
  } else {
    error = true;
  }
  if (error) {
    print('Invalid value for "entry_points" in the polymer transformer.');
  }
  return files;
}