Following the Angular 16 upgrade: Issue NG8001: 'element' is unrecognized as a component:

After running nx migrate to upgrade from angular 15 to angular 16, I encountered errors when trying to run nx s. The errors are as follows:

Error: apps/webshop/src/app/app.component.html:1:1 - error NG8001: 'eu-toolbar' is not a known element:

  1. If 'eu-toolbar' is an Angular component, ensure that it is part of this module.
  2. If 'eu-toolbar' is a Web Component, add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.

1 < eu-toolbar class="eu-app__header">
apps/webshop/src/app/app.component.ts:22:16 22 templateUrl: './app.component.html', ~~~~~~~~~~~~~~~~~~~~~~ Error occurs in the template of component AppComponent.

Error: apps/webshop/src/app/app.component.html:3:3 - error NG8001: 'router-outlet' is not a known element:

  1. If 'router-outlet' is an Angular component, verify that it is part of this module.
  2. If 'router-outlet' is a Web Component, add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.

3 ~~~~~~~~~~~~~~~

apps/webshop/src/app/app.component.ts:22:16 22 templateUrl: './app.component.html', ~~~~~~~~~~~~~~~~~~~~~~ Error occurs in the template of component AppComponent.
...

This issue appears to be related to a configuration error in my project post-upgrade, although everything was functioning properly in Angular 15. The correct declaration is in the app.module.ts file. Any guidance on where to investigate would be greatly appreciated.

app.component.html

<eu-toolbar class="eu-app__header"></eu-toolbar>
<div class="eu-app__content" #appContent (onResize)="handleItemResize($event)">
  <router-outlet></router-outlet>
  <eu-footer *ngIf="layout === 'eu-app--website'"></eu-footer>
</div>

app.module.ts

@NgModule({
  declarations: [
    AppComponent,
    PageNotFoundComponent,
    ToolbarComponent,      <---
    NavigationItemPipe,
    DashboardComponent,
    ShopcartFlyoutComponent,
    NoCustomerAssignedComponent,
  ],

toolbar.component.ts

@Component({
  selector: 'eu-toolbar',
  templateUrl: './toolbar.component.html',
  styleUrls: ['./toolbar.component.scss'],
})
export class ToolbarComponent implements OnInit, OnDestroy {

Answer №1

After days of troubleshooting, I finally cracked the code!

It turns out that the issue was with an outdated library called popperjs, which was no longer compatible with the new Angular 16 update. This caused a mysterious error that had me scratching my head for hours, as there were no direct references to the deprecated library.

Fortunately, I switched out popperjs for Floating-UI and voila - everything works smoothly once again.

Answer №2

Finally managed to get everything working!

To tackle this issue, I suggest identifying the outdated package that is causing the problem.

Caution ⚠️: This method may be a bit time-consuming, but it's the most effective solution I've found.

Firstly, revert the setting of legacy-peer-deps to false and update each package sequentially from top to bottom to ensure compatibility with Angular 16 during npm install.

If you're unsure about updating packages, look for dependency conflicts in your project files and make necessary adjustments based on compatibility requirements.

Secondly, if certain packages cannot be updated due to age constraints, try running "npm i --legacy-peer-deps" as a temporary fix before proceeding to the next step.

Thirdly, consider removing any references to outdated modules in your ngModule imports and observe changes in your application functionality by experimenting with different module configurations.

Please note that you may need to substitute obsolete packages with newer alternatives like ngx-mat-select-search or ngx-mask for smoother integration.

I hope these suggestions prove helpful in resolving your issue!

Answer №3

Let me shed some light on NgModules and how they function in order to potentially address your issue.

When utilizing NgModules, the "context" of AppComponent aligns with the NgModule in which it is declared.

Angular assesses the following elements:

<eu-toolbar class="eu-app__header"></eu-toolbar>
<div class="eu-app__content" #appContent (onResize)="handleItemResize($event)">
  <router-outlet></router-outlet>
  <eu-footer *ngIf="layout === 'eu-app--website'"></eu-footer>
</div>

and refers to AppModule (where AppComponent is declared) for determining the usage of:

  1. eu-toolbar
  2. router-outlet
  3. eu-footer
  4. ngIf

The guideline states that components should be either directly declared within the module or within its exported declarations.

It seems you have correctly imported ToolbarComponent (assuming the selector is unique), but the eu-footer component is missing. Make sure to add it to the declarations.

If you are importing RouterModule into AppModule (which exports the RouterOutlet component with the router-outlet selector), then router-outlet should function properly.

ngIf is a directive provided by CommonModule / BrowserModule, so importing one of these modules will include the directive in the context of AppComponent.

If everything mentioned above checks out, verify that the component @Input's are utilized correctly, and then refresh the development environment.

Answer №4

To resolve Error NG8001 following the Angular 17 update, it is recommended to set up the Angular project as a standalone entity.

Start by generating the project using the following command:

ng new ProjectName --standalone=false

Answer №5

After some trial and error, I finally got my code to work by making adjustments in my tsconfig. It's strange that our template type checking is malfunctioning in Angular 16.

      "compilerOptions": {
        "strict": false
      },
      "angularCompilerOptions": {
        "strictTemplates": false
      },

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