bug: Error in Angular Universal on build SSR on Lazy Loading module import

[ilprima]

Bug Report

After uploading to Ionic 5 and Angular 9 with the new lazy loading importing mode I have an error when trying to build the server.

The command used are:

"build:prod": "npm run build:ssr",
    "start:prerender": "npm run build:prerender & npm run serve:prerender",
    "serve:prerender": "node static.js",
    "build:prerender": "npm run build:prod && node dist/prerender.js"

Ionic version:

[x] 5.1.0

Current behavior:

The error thrown is:

------- Universal Project Entry File -------
src/main.server.ts
------- Entry Module Path -------
src/./app/app.server.module.ts
undefined:5
        loadChildren: '() => import('./home/home.module').then(m => m.HomePageModule)'
                                      ^

SyntaxError: Unexpected token /
    at /Users/app/dist/prerender.js:3251:70

**Expected behavior:**
<!-- Describe what the behavior would be without the bug. -->

**Steps to reproduce:**
<!--  Please explain the steps required to duplicate the issue, especially if you are able to provide a sample application. -->

Related code:

My modules are imported in the following way:

const routes: Routes =  [
    {path: '',
        children: [
            {
                path: 'home',
                children: [
                    {
                        path: '',
                        loadChildren: () => import('./home/home.module').then(m => m.HomePageModule)
                    }
                ],
            },{
                path: ':lang/home',
                children: [
                    {
                        path: '',
                        loadChildren: () => import('./home/home.module').then(m => m.HomePageModule)
                    }
                ],
            },

Other information:

Ionic info:

Ionic:

   Ionic CLI                     : 5.4.16
   Ionic Framework               : @ionic/angular 5.1.0
   @angular-devkit/build-angular : 0.901.5
   @angular-devkit/schematics    : 9.1.5
   @angular/cli                  : 9.1.5
   @ionic/angular-toolkit        : 2.2.0

Cordova:

   Cordova CLI       : 8.1.2 (cordova-lib@8.1.1)
   Cordova Platforms : android 7.1.4, browser 5.0.4, ios 4.5.5
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 4.1.2, (and 13 other plugins)

Utility:

   cordova-res (update available: 0.14.0) : 0.6.0
   native-run (update available: 1.0.0)   : 0.2.8

System:

   ios-deploy : 1.9.4
   ios-sim    : 8.0.0
   NodeJS     : v10.16.3 (/usr/local/bin/node)
   npm        : 6.11.3
   OS         : macOS Catalina
   Xcode      : Xcode 11.3 Build version 11C29

[ionitron-bot]

Thanks for the issue! This issue has been labeled as needs reproduction. This label is added to issues that need a code reproduction.

Please provide a reproduction with the minimum amount of code required to reproduce the issue. Without a reliable code reproduction, it is unlikely we will be able to resolve the issue, leading to it being closed.

For a guide on how to create a good reproduction, see our Contributing Guide.

[liamdebeasi]

Thanks for the issue! This issue is being closed due to the lack of a code reproduction. If this is still an issue with the latest version of Ionic, please create a new issue and ensure the template is fully filled out.

Thank you for using Ionic!