오류
../../../.pub-cache/hosted/pub.dev/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.
Dart 을 업그레이드 해주니 해결
dart pub upgrade
해결 : https://github.com/dart-lang/sdk/issues/52570
Watcher fails with `class 'FileSystemEvent' can't be extended`, for dart, not for flutter. · Issue #52570 · dart-lang/sdk
Commit: dart-lang/leak_tracker@4d2618b To repro run the test and see the build error: dart test /Users/polinach/_/leak_tracker/test/dart_debug/leak_tracking/end_to_end_test.dart Building package ex...
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