message: fix(express-engine): make server.ts compliant with typedef tslint rule
  Related to:
diff: @@ -9,7 +9,7 @@ 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() {
  +export function app(): void {
  const server = express();
  const distFolder = join(process.cwd(), '<%= browserDistDirectory %>');
  const indexHtml = existsSync(join(distFolder, 'index.original.html')) ? 'index.original.html' : 'index';
  @@ -37,7 +37,7 @@ export function app() {
  return server;
  }
  -function run() {
  +function run(): void {
  const port = process.env.PORT || <%= serverPort %>;
  // Start up the Node server
  