Test if watch is supported on the current system.
OS X 10.6 and below is not supported.
static bool get isWatchSupported { final IOOverrides overrides = IOOverrides.current; if (overrides == null) { return _FileSystemWatcher.isSupported; } return overrides.fsWatchIsSupported(); }
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https://api.dart.dev/stable/2.5.0/dart-io/FileSystemEntity/isWatchSupported.html