gulp browserify with update time

gistfile1.txt

gulp.task('browserify', function () {
    var bundler = browserify({
        entries:      [path.JS_MAIN],
        transform:    [[babelify]],
        debug:        true,
        cache:        {},
        packageCache: {},
        fullPaths:    true
    });

    var watcher = watchify(bundler);

    watcher.on('time', function (time) {
        util.log(util.colors.green('Browserify'), util.colors.blue('in ' + time / 1000 + 's'));
    });

    return watcher
        .on('update', function () {
            watcher.bundle()
                .on('error', function (error) {
                    console.log(error.message);
                })
                .pipe(source(path.OUT))
                .pipe(gulp.dest(path.TMP));
            util.log(util.colors.green('Browserify'), util.colors.yellow('updating'));
        })
        .bundle()
        .pipe(source(path.OUT))
        .pipe(gulp.dest(path.TMP));
});