server.ts

import * as express from 'express';
import { join } from 'path';
import { ngExpressEngine } from '@nguniversal/express-engine';
import { provideModuleMap } from '@nguniversal/module-map-ngfactory-loader';

import * as compression from 'compression';
import * as cache from 'memory-cache';

const PORT = process.env.PORT || 8080;
const staticRoot = join(process.cwd(), 'dist', 'store');
const { AppServerModuleNgFactory, LAZY_MODULE_MAP } = require('./dist/store-server/main');
const app = express();

app.use(compression());

const memCache = new cache.Cache();
const cacheMiddleware = (duration) => {
  return (req, res, next) => {
    const key = '__express__' + req.originalUrl || req.url;
    const cacheContent = memCache.get(key);
    if (cacheContent) {
      res.send(cacheContent);
      return;
    } else {
      res.sendResponse = res.send;
      res.send = (body) => {
        memCache.put(key, body, duration * 1000);
        res.sendResponse(body);
      };
      next();
    }
  };
};

app.engine('html', ngExpressEngine({
  bootstrap: AppServerModuleNgFactory,
  providers: [
    provideModuleMap(LAZY_MODULE_MAP)
  ]
}));

app.set('view engine', 'html');
app.set('views', staticRoot);
app.get('*.*', express.static(staticRoot));
app.get('*', cacheMiddleware(30), (req, res) => res.render('index', { req }));

app.listen(PORT, () => console.log(`Server listening on http://localhost:${PORT}`));