add internal notify api

index.js

@@ -400,9 +400,14 @@ module.exports = function(db, opts) {
 	};
 
 	fs.watch = function(key, opts, cb) {
+		if (typeof opts === 'function') return fs.watch(key, null, opts)
 		return listeners.watcher(ps.normalize(key), cb);
 	};
 
+	fs.notify = function(cb) {
+		listeners.on('change', cb)
+	}
+
 	fs.open = function(key, flags, mode, cb) {
 		if (typeof mode === 'function') return fs.open(key, flags, null, mode);
 

watchers.js

@@ -2,7 +2,7 @@ var events = require('events');
 
 module.exports = function() {
 	var listeners = {};
-	var that = {};
+	var that = new events.EventEmitter();
 
 	that.watch = function(key, cb) {
 		if (!listeners[key]) {
@@ -38,6 +38,7 @@ module.exports = function() {
 
 	that.change = function(key) {
 		if (listeners[key]) listeners[key].emit('change');
+		that.emit('change', key);
 	};
 
 	that.cb = function(key, cb) {