Quick example - gulp

gulpfile.js

"use strict";

var gulp        = require('gulp'),
    jshint      = require('gulp-jshint'),
    browserSync = require('browser-sync'),
    runSequence = require('run-sequence'),
    reload      = browserSync.reload;

gulp.task('lint', function() {
  return gulp.src('./app/**/*.js')
    .pipe(jshint())
    .pipe(jshint.reporter('default'));
});

gulp.task('serve', function(cb) {
    browserSync({
        port: 8080,
        server: {
            baseDir: "./"
        }
    });

    gulp.watch([
      "./app/**/*.js",
      "./app/**/*.html",
      "./assets/css/**/*.css",
      "./assets/img/**/*.*",
      "./index.html"
    ], browserSync.reload, cb);
});

gulp.task('default', function (cb) {
  runSequence('lint', 'test', cb);
});

package.json

{
  "name": "public",
  "version": "1.0.0",
  "description": "Demo",
  "main": " ",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Gonzalo Barba",
  "license": "ISC",
  "devDependencies": {
    "browser-sync": "^2.2.2",
    "gulp": "^3.8.11",
    "gulp-jshint": "^1.9.4",
    "run-sequence": "^1.0.2"
  },
  "peerDependencies": {
    "gulp": "^3.8.11",
    "browser-sync": "^2.2.2"
  }
}