isWatchSupported property
bool isWatchSupportedTest if watch is supported on the current system.
OS X 10.6 and below is not supported.
Source
static bool get isWatchSupported => _FileSystemWatcher.isSupported;
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-io/FileSystemEntity/isWatchSupported.html