server-express.ts

import 'zone.js/node';

import * as engine from '@nguniversal/express-engine';
import express from 'express';
import { join } from 'path';

import { AppServerModule } from './client/src/main.server';
import { APP_BASE_HREF } from '@angular/common';
import { existsSync } from 'fs';

// The Express app is exported so that it can be used by serverless Functions.
export function app() {
  const server = express();
  const distFolder = join(process.cwd(), 'dist/eshop/browser');
  const indexHtml = existsSync(join(distFolder, 'index.html')) ? 'index.html' : 'index';

  // Our Universal express-engine (found @ https://github.com/angular/universal/tree/master/modules/express-engine)
  server.engine('html', engine.ngExpressEngine({
    bootstrap: AppServerModule,
  }));

  server.set('view engine', 'html');
  server.set('views', distFolder);

  // Serve static files from /browser
  server.get('*.*', express.static(distFolder, {
    maxAge: '1y'
  }));

  // All regular routes use the Universal engine
  server.get('*', (req, res) => {
    res.render(indexHtml, {
      req,
      res,
      providers: [
        {
          provide: APP_BASE_HREF,
          useValue: req.baseUrl
        },
        {
          provide  : 'REQUEST',
          useValue : (req)
        },
        {
          provide  : 'RESPONSE',
          useValue : (res)
        }
      ]
    });
  });


  return server;
}

function run() {
  const port = process.env.PORT || 3000;

  // Start up the Node server
  const server = app();
  server.listen(port, () => {
    console.log(`Node Express server listening on http://localhost:${port}`);
  });
}

// Webpack will replace 'require' with '__webpack_require__'
// '__non_webpack_require__' is a proxy to Node 'require'
// The below code is to ensure that the server is run only when not requiring the bundle.
declare const __non_webpack_require__: NodeRequire;
const mainModule = __non_webpack_require__.main;
const moduleFilename = mainModule && mainModule.filename || '';
if (moduleFilename === __filename || moduleFilename.includes('iisnode')) {
  run();
}

export * from './client/src/main.server';