frontend/src/app/app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RouteReuseStrategy } from '@angular/router';

import { IonicModule, IonicRouteStrategy } from '@ionic/angular';
import { SplashScreen } from '@ionic-native/splash-screen/ngx';
import { StatusBar } from '@ionic-native/status-bar/ngx';

import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';
import { HttpClientModule } from '@angular/common/http';
import { ComponentsModule } from './components/components.module';
import { TreeModule } from '@circlon/angular-tree-component';
import {AgGridModule} from 'ag-grid-angular';
import {MonacoEditorModule} from 'ngx-monaco-editor';
import { APP_BASE_HREF, PlatformLocation } from '@angular/common';
import {MarkdownModule, MarkedOptions} from 'ngx-markdown';
import {ConnectionServiceModule} from 'ng-connection-service';
import { ServiceWorkerModule } from '@angular/service-worker';
import { environment } from '../environments/environment';
import { AngularResizedEventModule } from 'angular-resize-event';
import { IonicSelectableModule } from 'ionic-selectable';
import * as hljs from 'highlight.js';
import { HighlightModule, HIGHLIGHT_OPTIONS } from 'ngx-highlightjs';

/**
 * This function is used internal to get a string instance of the `<base href="" />` value from `index.html`.
 * This is an exported function, instead of a private function or inline lambda, to prevent this error:
 *
 * `Error encountered resolving symbol values statically.`
 * `Function calls are not supported.`
 * `Consider replacing the function or lambda with a reference to an exported function.`
 *
 * @param platformLocation an Angular service used to interact with a browser's URL
 * @return a string instance of the `<base href="" />` value from `index.html`
 */
export function getBaseHref(platformLocation: PlatformLocation): string {
  return platformLocation.getBaseHrefFromDOM();
}

@NgModule({
  declarations: [AppComponent],
  entryComponents: [],
  imports: [
    BrowserModule,
    IonicModule.forRoot(),
    AppRoutingModule,
    HttpClientModule,
    ComponentsModule,
    TreeModule,
    AgGridModule.withComponents([]),
    MonacoEditorModule.forRoot(),
    HighlightModule,
    MarkdownModule.forRoot({
      markedOptions: {
        provide: MarkedOptions,
        useValue: {
          highlight(code: string, lang: string, callback?: (error: any, code: string) => void): string {
            const highlighted = hljs.highlight(lang, code, true);

            if ( callback ) {
              callback(null, highlighted.value);
            }

            return highlighted.value;
          },
        },
      }
    }),
    ConnectionServiceModule,
    ServiceWorkerModule.register('ngsw-worker.js', { enabled: environment.production }),
    AngularResizedEventModule,
    IonicSelectableModule,
  ],
  providers: [
    StatusBar,
    SplashScreen,
    { provide: RouteReuseStrategy, useClass: IonicRouteStrategy },
    {
      provide: APP_BASE_HREF,
      useFactory: getBaseHref,
      deps: [PlatformLocation]
    },
    {
      provide: HIGHLIGHT_OPTIONS,
      useValue: {
        fullLibraryLoader: () => import('highlight.js'),
      }
    },
  ],
  bootstrap: [AppComponent]
})
export class AppModule {}