Как добиться работы javascript при livereload browser-sync?

//main
var gulp = require('gulp');
var watch = require('gulp-watch');
var plumber = require('gulp-plumber');
//css
var autoprefix = require('gulp-autoprefixer');
var sass = require('gulp-sass');
var csso = require('gulp-csso');
var uncss = require('gulp-uncss');
var media = require('gulp-group-css-media-queries');
//other
var browserSync = require('browser-sync');
var rename = require('gulp-rename');

gulp.task('sass', function() {
	return gulp.src('scss/*.scss')
		.pipe(plumber())
		.pipe(sass({outputStyle: 'expanded'}).on('error', sass.logError))
		.pipe(rename({suffix: '.min'}))
		.pipe(gulp.dest('css/'))
		.pipe(browserSync.reload({stream: true}));
});

gulp.task('build', function() {
	return gulp.src('scss/*.scss')
		.pipe(plumber())
		.pipe(sass({outputStyle: 'default'}).on('error', sass.logError))
		.pipe(media())
		.pipe(uncss({
			html: ['index.html']
		}))
		.pipe(autoprefix([
      'Android 2.3',
      'Android >= 4',
      'Chrome >= 50',
      'Firefox >= 24',
      'Explorer >= 6',
      'iOS >= 6',
      'Opera >= 12',
      'Safari >= 6']))
		.pipe(csso({
			debug: true
		}))
		.pipe(rename({suffix: '.min'}))
		.pipe(gulp.dest('css/'))
		.pipe(browserSync.reload({stream: true}));
})

gulp.task('build-themes', function() {
	return gulp.src('scss/colors/*.scss')
		.pipe(plumber())
		.pipe(sass({outputStyle: 'default'}).on('error', sass.logError))
		.pipe(csso({
			debug: true
		}))
		.pipe(gulp.dest('css/colors/'))
		.pipe(browserSync.reload({stream: true}));
})



gulp.task('browserSync', function() {
    browserSync.init({
        server: {
            baseDir: "./",
            notify: false
        }
    });
});

gulp.task('watch', ['browserSync', 'sass'], function() {
	gulp.watch('scss/*.scss', ['sass']);
	gulp.watch(['index.html','js/*.js'], browserSync.reload);
});