Angular 9 Project не работает в производственной среде

Я перенес наш гибридный проект Angular с 8 на 9. Миграция прошла гладко, и ng build / ng serve работает так же, как и раньше.

Настоящая проблема, когда я не знаю, как начать работать над ней, возникает после того, как я создаю приложение для производства (ng build --prod). Целевая страница проекта полностью пуста, без ошибок JS, без предупреждений консоли. Похоже, AppModule не загружается? Единственное изменение, которое нам пришлось сделать, было связано с файлом main.aot.ts, мы удалили этот файл, поскольку он больше не применим к компилятору IVY.

Любой соответствующий опыт, который у вас может быть в прошлом, поможет мне, большое спасибо!

main.ts выглядит так

import {enableProdMode, StaticProvider} from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';
import { environment } from './environments/environment';
import {downgradeModule} from "@angular/upgrade/static";

if (environment.production) {
  enableProdMode();
}
declare var angular: any;

const bootstrapFn = (extraProviders: StaticProvider[]) => {
  const platformRef = platformBrowserDynamic(extraProviders);
  return platformRef.bootstrapModule(AppModule);
};
const downgradedModule = downgradeModule(bootstrapFn);
angular.bootstrap(document.getElementById('app-root'), ['angularJSModule', downgradedModule], { strictDi: true });

main.aot.ts (удалено на Angular9)

import {enableProdMode, StaticProvider} from '@angular/core';
import { platformBrowser } from '@angular/platform-browser';
import {AppModuleNgFactory} from './app/app.module.ngfactory';
import { environment } from './environments/environment';
import {downgradeModule} from "@angular/upgrade/static";

if (environment.production) {
  enableProdMode();
}
declare var angular: any;

const bootstrapFn = (extraProviders: StaticProvider[]) => {
  const platformRef = platformBrowser(extraProviders);
  return platformRef.bootstrapModuleFactory(AppModuleNgFactory);
};
const downgradedModule = downgradeModule(bootstrapFn);
angular.bootstrap(document.getElementById('app-root'), ['angularJSModule', downgradedModule], { strictDi: true });

tsconfig.json

{
  "compileOnSave": true,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    "module": "esnext",
    "moduleResolution": "node",
    "importHelpers": true,
    "target": "es2015",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2018",
      "dom"
    ],
    "types": ["angular"]
  },
  "angularCompilerOptions": {
    "fullTemplateTypeCheck": true,
    "strictInjectionParameters": true
  }
}

tsconfig.app.json

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "outDir": "./out-tsc/app",
    "types": ["angular"]
  },
  "files": [
    "src/main.ts",
    "src/polyfills.ts"
  ],
  "include": [
    "src/**/*.d.ts"
  ],
  "exclude": [
    "src/test.ts",
    "src/**/*.spec.ts"
  ]
}

package.json

{
  "name": "myproj",
  "version": "4.5.0",
  "start": "ng serve -aot",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~9.0.5",
    "@angular/cdk": "~9.1.1",
    "@angular/common": "~9.0.5",
    "@angular/compiler": "~9.0.5",
    "@angular/core": "~9.0.5",
    "@angular/fire": "^5.4.2",
    "@angular/forms": "~9.0.5",
    "@angular/material": "^9.1.1",
    "@angular/platform-browser": "~9.0.5",
    "@angular/platform-browser-dynamic": "~9.0.5",
    "@angular/router": "~9.0.5",
    "@angular/upgrade": "^9.0.5",
    "@ng-idle/core": "^8.0.0-beta.4",
    "@ng-idle/keepalive": "^8.0.0-beta.4",
    "@uirouter/angular": "^6.0.1",
    "@uirouter/angular-hybrid": "^10.0.1",
    "@uirouter/angularjs": "^1.0.25",
    "@uirouter/core": "^6.0.4",
    "@uirouter/rx": "^0.6.5",
    "angular": "^1.7.9",
    "foundation-sites": "^6.6.1",
    "install": "^0.13.0",
    "ng-block-ui": "^2.1.8",
    "ngx-cookie-service": "^2.4.0",
    "ngx-foundation": "^1.0.8",
    "ngx-pendo": "^1.2.3",
    "ngx-perfect-scrollbar": "^8.0.0",
    "npm": "^6.14.2",
    "rxjs": "~6.5.4",
    "tslib": "^1.10.0",
    "upgrade": "^1.1.0",
    "zone.js": "~0.10.2"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.900.5",
    "@angular/cli": "~9.0.5",
    "@angular/compiler-cli": "~9.0.5",
    "@angular/language-service": "~9.0.5",
    "@types/angular": "^1.6.57",
    "@types/jasmine": "~3.3.8",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "^12.11.1",
    "codelyzer": "^5.1.2",
    "jasmine-core": "~3.4.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.1.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.5.2",
    "protractor": "^5.4.3",
    "ts-node": "~7.0.0",
    "tslint": "~5.15.0",
    "typescript": "~3.7.5"
  }
}