| 1 2 3 | Failed to build intl_utils:generate: ../../../.pub-cache/hosted/pub.flutter-io.cn/watcher-1.0.2/lib/src/constructable_file_system_event.dart:7:57: Error: The class 'FileSystemEvent' can't be extended, implemented, or mixed in outside of its library because it's a sealed class. abstract class _ConstructableFileSystemEvent implements FileSystemEvent { | 
请尝试
| 1 | dart pub upgrade | 
命令,如果还是报错
| 1 | dart pub cache repair | 
这样我们就可以使用到最新的watcher-1.1.0版本,就不会出现上面这个报错了。
