threejs/tasks/server.js

import gulp from 'gulp';
import gulpif from 'gulp-if';
import liveserver from 'gulp-live-server';
import args from './util/args';

gulp.task('server',(cb)=>{
    if(!args.watch) return cb();
    
    var server = liveserver.new(['--harmony', 'server/bin/www']);
    server.start();

    gulp.watch(['server/public/**/*.js', 'server/public/**/*.ejs'], function(file){
        server.notify.apply(server, [file])
    })

    gulp.watch(['server/routes/**/*.js', 'server/app.js'], function(){
        server.start.bind(server)()
    })
})