clickPackage click provides methods to compose click handlers.
notifierPackage notifier provides a channel that can send update notifications.
valuePackage value provides atomic values with update notifications.
watchers/dbusPackage dbus provides watchers that notify when dbus name owners or object properties change, and infrastructure for testing code that uses them.
watchers/filePackage file uses the fsnotify library to watch for changes to files.
watchers/localtzPackage localtz watches for changes to the local machine's time zone.
watchers/netlinkPackage netlink uses the netlink library to watch for changes in link states.

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