Source

List<ElementType> get typeArguments {
  var type = _type;
  if (type is FunctionType) {
    Iterable<DartType> typeArguments;
    if (type.element is FunctionTypeAliasElement &&
        type.typeFormals.isEmpty) {
      // TODO(jmesserly): simplify check above; we should have a way
      // to find instantiated typedefs without consulting the element.
      // Also, it will not work if we support typedefs declared inside classes.
      typeArguments = type.typeArguments;
    } else {
      typeArguments = type.typeFormals.map((f) => f.type);
    }
    return typeArguments.map(_getElementTypeFrom).toList();
  } else {
    return (_type as ParameterizedType)
        .typeArguments
        .map((f) => _getElementTypeFrom(f))
        .toList();
  }
}