Running Aurelia-CLI with Node ExpressJS

app.js

'use strict';

// simple express server
var express = require('express');
var path = require('path');
var app = express();
var router = express.Router();

app.use("/scripts", express.static(path.join(__dirname, 'scripts')));
app.get('/', function(req, res) {
    res.sendfile('./index.html');
});

app.listen(9000);

aurelia_project-tasks-run.js

import gulp from 'gulp';
import browserSync from 'browser-sync'
import historyApiFallback from 'connect-history-api-fallback/lib';;
import project from '../aurelia.json';
import build from './build';
import {CLIOptions} from 'aurelia-cli';
import * as nodemon from 'gulp-nodemon';

function onChange(path) {
  console.log(`File Changed: ${path}`);
}

function reload(done) {
  browserSync.reload();
  done();
}

function runNode(cb) {
	let started = false;
	
	return nodemon.default({
		script: 'app.js'
	}).on('start', function () {
		if (!started) {
			cb();
			started = true; 
		} 
	});
}

let serve = gulp.series(
  build,
  runNode,
  done => {
    browserSync({
      online: false,
      open: false,
      port: 7000,
      proxy: "http://localhost:9000",
      logLevel: 'silent',
      server: {
        baseDir: ['.'],
        middleware: [historyApiFallback(), function(req, res, next) {
          res.setHeader('Access-Control-Allow-Origin', '*');
          next();
        }]
      }
    }, function (err, bs) {
      let urls = bs.options.get('urls').toJS();
      console.log(`Application Available At: ${urls.local}`);
      console.log(`BrowserSync Available At: ${urls.ui}`);
      done();
    });
  }
);

let refresh = gulp.series(
  build,
  reload
);

let watch = function() {
  gulp.watch(project.transpiler.source, refresh).on('change', onChange);
  gulp.watch(project.markupProcessor.source, refresh).on('change', onChange);
  gulp.watch(project.cssProcessor.source, refresh).on('change', onChange)
}

let run;

if (CLIOptions.hasFlag('watch')) {
  run = gulp.series(
    serve,
    watch
  );
} else {
  run = serve;
}

export default run;

cmd

npm install --save express
npm install --save-dev nodemon

Cool, I was exactly trying the same approach with 'proxy' option, except I wasn't able to figure out the "runNode" task.
Thanks Vildan.