Uncaught (in promise): TypeError: Cannot read property 'ɵcmp' of undefined in angular 10

Question

I am getting this error Uncaught (in promise): TypeError: Cannot read property 'ɵcmp' of undefined in angular when trying to load the app I just compiled with --prod flag with both optimization and buildOptimizer set as true, when I set both to false the issue disappear and application is loading without issues but the application size is bigger and performance isn't as expected, I need to build a production with both optimization and buildOptimizer set as true, anyone have a good solution to this issue?

angular.json file :

            "staging": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.staging.ts"
                }
              ],
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "budgets": [
                {
                  "type": "initial",
                  "maximumWarning": "2mb",
                  "maximumError": "5mb"
                },
                {
                  "type": "anyComponentStyle",
                  "maximumWarning": "6kb",
                  "maximumError": "10kb"
                }
              ]
            }

My Code in .ts to load dynamic component and this part not work when production angular application and have pervious error :

//Directive created
  @ViewChild(RequestsDirective) tabHost: RequestsDirective;

  constructor(
    private componentFactoryResolver: ComponentFactoryResolver,
    private viewContainerRef: ViewContainerRef,
    public requestsMainService: RequestsMainService,
    private spinner: NgxSpinnerService) { }

  ngOnInit(): void { }

  // Load Component in ng template  and set request name in services and hide category - request type part
  async loadTabComponent(_requestid: number, _requestname: string) {
    //debugger;
    // to set request name dynamic in all requests
    this.requestsMainService.RequestName = _requestname;
    // Hide Category And Requests type
    $('#div_main').hide('slow');

    // Search in App Model about component name
    const factories = Array.from( 
        this.componentFactoryResolver['ngModule']
            .instance.constructor.ɵmod.declarations
    );
    const factoryClass = factories.find(
        (x: any) => x.name === ('Request1Component')
    ) as Type<any>;

    // clear any previous component
    this.viewContainerRef.detach();
    this.viewContainerRef.clear();
    // get dynamic component by name
    const componentFactory = this.componentFactoryResolver.resolveComponentFactory(factoryClass);
    // load it in ng template
    this.viewContainerRef = this.tabHost.viewContainerRef;
    this.viewContainerRef.createComponent(componentFactory);
  }

Note

Request1Component this name of component I want to load it dynamic

Answer 1

I was faced this error while used microfrontends with NX on angular 15, and it was happened because some of components inside the shared lib were not exported from index.ts file. Just check the index.ts files which component you forgot to export.