我用Dartpad编写了以下代码，它返回以下错误:
编译为JavaScript时出错:不支持的导入:
包:Collection/Collection tion.dart
import "包:Collection/Collection tion.dart";
main(List<String> args) {
var data = [
{"title": 'Avengers', "release_date": '10/01/2019'},
{"title": 'Creed', "release_date": '10/01/2019'},
{"title": 'Jumanji', "release_date": '30/10/2019'},
];
var newMap = groupBy(data, (obj) =>
(obj as dynamic)['release_date']
);
print(newMap);
}
有什么办法可以解决吗？
