gulpfile.js

var gulp = require('gulp');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');
var less = require('gulp-less');
var del = require('del');
var htmlmin = require('gulp-htmlmin');
var merge = require('merge-stream');
var nodemon = require('gulp-nodemon');
var cssmin = require('gulp-cssmin');
var rename = require('gulp-rename');

var libScripts = [
    "www/static/bower_components/jquery/dist/jquery.js",
    "www/static/bower_components/bootstrap/dist/js/bootstrap.js",
    "www/static/bower_components/angular/angular.js",
    "www/static/bower_components/google-code-prettify/src/prettify.js",
    "www/static/bower_components/moment/moment.js"
];

var paths = {
    scripts: libScripts.concat(['www/static/js/*.js']),
    less   : ['www/static/css/*.less']
};

// Not all tasks need to use streams
// A gulpfile is just another node program and you can use any package available on npm
gulp.task('clean', function (cb) {
    // You can use multiple globbing patterns as you would with `gulp.src`
    del(['www/static/dist'], cb);
});

gulp.task('scripts:dev', function () {
    return gulp.src(paths.scripts)
        .pipe(concat('lc-request.js'))
        .pipe(gulp.dest('./www/static/dist'));
});

gulp.task('scripts:build', function (result) {
    return gulp.src(paths.scripts)
        .pipe(concat('lc-request.min.js'))
        .pipe(uglify())
        .pipe(gulp.dest('./www/static/dist'));
});

// Copy all static images
gulp.task('lessc:dev', function () {
    return gulp.src('./www/static/css/main.less')
        .pipe(less())
        .pipe(gulp.dest('./www/static/dist'));
});

gulp.task('lessc:build', function () {
    return gulp.src('./www/static/css/main.less')
        .pipe(less())
        .pipe(cssmin())
        .pipe(rename({suffix: '.min'}))
        .pipe(gulp.dest('./www/static/dist'));
});

gulp.task('start', function () {
    nodemon({
        script: 'app.js',
        ext   : 'js',
        watch : "server",
        env   : {
            'NODE_ENV': 'development'
            //'DEBUG': 'http express:*'
        }
    })
});

// Rerun the task when a file changes
gulp.task('watch', function () {
    gulp.watch(paths.scripts, ['scripts:dev']);
    gulp.watch(paths.less, ['lessc:dev']);
});

// The default task (called when you run `gulp` from cli)
gulp.task('default', ['watch', 'scripts:dev', 'lessc:dev', 'start']);

gulp.task('build', ['scripts:build', 'lessc:build']);