Gulpfile.js

'use strict';

var gulp = require('gulp'),
    nodemon = require('gulp-nodemon'),
    watch = require('gulp-watch'),
    jshint = require('gulp-jshint'),
    livereload = require('gulp-livereload'),
    browserify = require('browserify'),
    source = require('vinyl-source-stream'),
    watchify = require('watchify');

var production = process.env.NODE_ENV === 'production';

function handleError() {
  return function(err) {
    console.log(err);
  };
}

function scripts(watch) {
  var bundler, rebundle;
  bundler = browserify('./public/js/app.js', {
    basedir: __dirname,
    debug: !production,
    cache: {}, // required for watchify
    packageCache: {}, // required for watchify
    fullPaths: watch // required to be true only for watchify
  });
  if(watch) {
    bundler = watchify(bundler);
  }

  rebundle = function() {
    var stream = bundler.bundle();
    stream.on('error', handleError());
    stream = stream.pipe(source('bundle.js'));
    return stream.pipe(gulp.dest('./public/js'));
  };

  bundler.on('update', rebundle);
  return rebundle();
}

//register nodemon task
gulp.task('nodemon', function () {
  nodemon({ script: './bin/www', env: { 'NODE_ENV': 'development' }})
    .on('restart');
});

// Rerun the task when a file changes
gulp.task('watch', function() {
    var server = livereload();
    gulp.src(['*.js','routes/*.js', 'public/*.js'], { read: true })
        .pipe(watch({ emit: 'all' }))
        .pipe(jshint())
        .pipe(jshint.reporter('default'));

    gulp.watch(['*.js','routes/*.js', 'views/**/*.*', 'public/**/*.*']).on('change', function(file) {
      server.changed(file.path);
  });
});

//lint js files
gulp.task('lint', function() {
    gulp.src(['*.js','routes/*.js', 'public/*.js'])
        .pipe(jshint())
        .pipe(jshint.reporter('default'));
});

gulp.task('scripts', function() {
  return scripts(false);
});

gulp.task('watchScripts', function() {
  return scripts(true);
});

// The default task (called when you run `gulp` from cli)
gulp.task('default', ['lint','nodemon', 'watch', 'watchScripts']);