gulpfile.js

const 
    gulp = require('gulp'),
    uglify = require('gulp-uglify-cli'),
    concat = require('gulp-concat'),
    argv = require('yargs').argv,
    exec = require('child_process').exec;


gulp.task('run', ['build', 'watch'], function (cb) {
    exec('npm run start', function (err, stdout, stderr) {
        console.log(stdout);
        console.log(stderr);
        console.log(err);
        cb(err);
    });
});

gulp.task('build', ['build:js']);
gulp.task('build:js', function(cb) {
    var layoutBundle = gulp.src([
        'public/js/src/*.js', 
        '!public/js/src/registration.js',
        '!public/js/src/auth.js',
        '!public/js/src/booking.js',
        '!public/js/src/localization.js',
        '!public/js/src/faq.js',
        '!public/js/src/tickets.js',
        '!public/js/src/calendar.js',
        '!public/js/src/account.js',
        '!public/js/src/rates.js',
    ])
        .pipe(concat('layout.bundle.js'));
    var libBundle = gulp.src([
        'public/js/lib/jquery/*.js', 
        'public/js/lib/tether/*.js',
        'public/js/lib/jqueryui/*.js',
        'public/js/lib/conflictfixes/*.js',
        'public/js/lib/datetimepicker/*.js',
        'public/js/lib/*.js'
        ])
        .pipe(concat('lib.bundle.js'));
    if (!argv.dev) {
        layoutBundle = layoutBundle.pipe(uglify());
        libBundle = libBundle.pipe(uglify());
    }
        
    layoutBundle.pipe(gulp.dest('public/js/dist'));
    libBundle.pipe(gulp.dest('public/js/dist'));
});
gulp.task('watch', function() {
    gulp.watch('public/js/src/*.js', ['build:js']);
});