How to make nodemon and browserSync work together in a Gulp setup. From http://denbuzze.com/post/5-lessons-learned-using-gulpjs/

gulpfile.js

gulp.task('nodemon', function(cb) {
  var nodemon = require('gulp-nodemon');

  // We use this `called` variable to make sure the callback is only executed once
  var called = false;
  return nodemon({
    script: 'server.js',
    watch: ['server.js', 'server/**/*.*']
  })
  .on('start', function onStart() {
    if (!called) {
      cb();
    }
    called = true;
  })
  .on('restart', function onRestart() {

    // Also reload the browsers after a slight delay
    setTimeout(function reload() {
      browserSync.reload({
        stream: false
      });
    }, 500);
  });
});

// Make sure `nodemon` is started before running `browser-sync`.
gulp.task('browser-sync', ['index', 'nodemon'], function() {
  var port = process.env.PORT || 5000;
  browserSync.init({

    // All of the following files will be watched
    files: ['public/**/*.*'],

    // Tells BrowserSync on where the express app is running
    proxy: 'http://localhost:' + port,

    // This port should be different from the express app port
    port: 4000,

    // Which browser should we launch?
    browser: ['google chrome']
  });
});