extensions/git/src/repository.ts/DotGitWatcher/constructor
class DotGitWatcher:	constructor(
		private repository: Repository,
		private outputChannel: OutputChannel
	) {
		const rootWatcher = watch(repository.dotGit);
		this.disposables.push(rootWatcher);

		// Ignore changes to the "index.lock" file, and watchman fsmonitor hook (https://git-scm.com/docs/githooks#_fsmonitor_watchman) cookie files.
		// Watchman creates a cookie file inside the git directory whenever a query is run (https://facebook.github.io/watchman/docs/cookies.html).
		const filteredRootWatcher = filterEvent(rootWatcher.event, uri => !/\/\.git(\/index\.lock)?$|\/\.watchman-cookie-/.test(uri.path));
		this.event = anyEvent(filteredRootWatcher, this.emitter.event);

		repository.onDidRunGitStatus(this.updateTransientWatchers, this, this.disposables);
		this.updateTransientWatchers();
	}