gulpfile-express.js

var gulp = require('gulp'),
  sass = require('gulp-sass'),
  browserify = require('gulp-browserify'),
  concat = require('gulp-concat'),
  embedlr = require('gulp-embedlr'),
  refresh = require('gulp-livereload'),
  lrserver = require('tiny-lr')(),
  express = require('express'),
  livereload = require('connect-livereload')
  livereloadport = 35729,
  serverport = 5000;

//We only configure the server here and start it only when running the watch task
var server = express();
//Add livereload middleware before static-middleware
server.use(livereload({
  port: livereloadport
}));
server.use(express.static('./build'));

//Task for sass using libsass through gulp-sass
gulp.task('sass', function(){
  gulp.src('sass/*.scss')
    .pipe(sass())
    .pipe(gulp.dest('build'))
    .pipe(refresh(lrserver));
});

//Task for processing js with browserify
gulp.task('browserify', function(){
  gulp.src('js/*.js')
   .pipe(browserify())
   .pipe(concat('bundle.js'))
   .pipe(gulp.dest('build'))
   .pipe(refresh(lrserver));

});

//Task for moving html-files to the build-dir
//added as a convenience to make sure this gulpfile works without much modification
gulp.task('html', function(){
  gulp.src('views/*.html')
    .pipe(gulp.dest('build'))
    .pipe(refresh(lrserver));
});

//Convenience task for running a one-off build
gulp.task('build', function() {
  gulp.run('html', 'browserify', 'sass');
});

gulp.task('serve', function() {
  //Set up your static fileserver, which serves files in the build dir
  server.listen(serverport);

  //Set up your livereload server
  lrserver.listen(lrport);
});

gulp.task('watch', function() {

  //Add watching on sass-files
  gulp.watch('sass/*.scss', function() {
    gulp.run('sass');
  });
  
  //Add watching on js-files
  gulp.watch('js/*.js', function() {
    gulp.run('browserify');
  });

  //Add watching on html-files
  gulp.watch('views/*.html', function () {
    gulp.run('html');
  });
});

gulp.task('default', function () {
  gulp.run('build', 'serve', 'watch');
});

gulpfile.js

var http = require('http');
var gulp = require('gulp');
var browserify = require('gulp-browserify');
var concat = require('gulp-concat');
var less = require('gulp-less');
var refresh = require('gulp-livereload');
var lr = require('tiny-lr');
var lrserver = lr();
var minifyCSS = require('gulp-minify-css');
var embedlr = require('gulp-embedlr');
var ecstatic = require('ecstatic');
var imagemin = require('gulp-imagemin');

var livereloadport = 35729,
    serverport = 5001;

gulp.task('scripts', function() {
    return gulp.src(['app/src/**/*.js'])
        .pipe(browserify())
        .pipe(concat('dest.js'))
        .pipe(gulp.dest('dist/build'))
        .pipe(refresh(lrserver));
});

gulp.task('styles', function() {
    return gulp.src(['app/css/style.less'])
        .pipe(less())
        .on('error', console.log)
        .pipe(minifyCSS())
        .pipe(gulp.dest('dist/build'))
        .pipe(refresh(lrserver));
});

gulp.task('serve', function() {
  //Set up your static fileserver, which serves files in the build dir
  http.createServer(ecstatic({ root: __dirname + '/dist' })).listen(serverport);

  //Set up your livereload server
  lrserver.listen(livereloadport);
});


gulp.task('html', function() {
    return gulp.src("app/*.html")
        .pipe(embedlr())
        .pipe(gulp.dest('dist/'))
        .pipe(refresh(lrserver));
})

gulp.task('assets', function() {
    return gulp.src("app/assets/**")
        .pipe(imagemin({optimizationLevel: 5}))
        .pipe(gulp.dest('dist/assets/'))
        .pipe(refresh(lrserver));
});

// Requires gulp >=v3.5.0
gulp.task('watch', function () {
    gulp.watch('app/src/**', ['scripts']);
    gulp.watch('app/css/**', ['styles']);
    gulp.watch('app/**/*.html', ['html']);
    gulp.watch('app/assets/**', ['assets']);
});

gulp.task('default', ['scripts', 'styles', 'html', 'assets', 'serve', 'watch']);