Подскажите и gulp и bower подключение jquery

var gulp = require('gulp'), 
  minCSS = require('gulp-clean-css'), 
  sass = require('gulp-sass'), 
  browserSync = require('browser-sync').create(); 
bower = require('bower'); 
 
gulp.task('serve', ['sass'], function() { 
 
  browserSync.init({ 
    server: "app/" 
  }); 
 
  gulp.watch("app/assets/sass/*.sass", ['sass']); 
  gulp.watch("app/*.html").on('change', browserSync.reload); 
  gulp.watch("app/assets/js/*.js").on('change', browserSync.reload); 
}); 
 
gulp.task('sass', function() { 
  return gulp.src("app/assets/sass/*.sass") 
    .pipe(sass()) 
    .pipe(gulp.dest("app/assets/css")) 
    .pipe(browserSync.stream()); 
}); 
 
gulp.task('default', ['serve']);