<div id="readability-page-1" class="page"><p data-ke-size="size16">../../../.pub-cache/hosted/pub.dev/watcher-1.0.2/lib/src/constructable_file_system_event.dart:7:57:&nbsp;Error:&nbsp;The&nbsp;class&nbsp;'FileSystemEvent'&nbsp;can't&nbsp;be&nbsp;extended,&nbsp;implemented,&nbsp;or&nbsp;mixed&nbsp;in&nbsp;outside&nbsp;of&nbsp;its&nbsp;library&nbsp;because&nbsp;it's&nbsp;a&nbsp;sealed&nbsp;class.</p><div id="og_1700793040662" contenteditable="false" data-ke-type="opengraph" data-ke-align="alignCenter" data-og-type="object" data-og-title="Watcher fails with `class 'FileSystemEvent' can't be extended`, for dart, not for flutter. · Issue #52570 · dart-lang/sdk" data-og-description="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..." data-og-host="github.com" data-og-source-url="https://github.com/dart-lang/sdk/issues/52570" data-og-url="https://github.com/dart-lang/sdk/issues/52570" data-og-image="https://scrap.kakaocdn.net/dn/wRRXh/hyUB7wjT45/axeednljTBUHKqREmtL3h1/img.png?width=1200&amp;height=600&amp;face=0_0_1200_600"><a href="https://github.com/dart-lang/sdk/issues/52570" target="_blank" rel="noopener" data-source-url="https://github.com/dart-lang/sdk/issues/52570">

<div>
<p data-ke-size="size16">Watcher fails with `class 'FileSystemEvent' can't be extended`, for dart, not for flutter. · Issue #52570 · dart-lang/sdk</p>
<p data-ke-size="size16">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...</p>
<p data-ke-size="size16">github.com</p>
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</a></div></div>

대부류 - [Dev u Ryu]

류지훈

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

Flutter - ../../../.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.

Flutter - ../../../.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.

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