Dealing with precompile array warning when utilizing a basic router in Angular 2

I am currently working on developing a straightforward router-based application in Angular2 using typescript. The version of Angular2 I am using is 2.0.0-rc.4, and the router version is 3.0.0-beta.1

Here is my Routes configuration-

App.routes.ts

import { provideRouter, RouterConfig } from '@angular/router';
import { PageNotFoundComponent } from './Shared/pageNotFound.component';
import { Page1Component } from './Pages/Page1/page1.component';
import { Page2Component } from './Pages/Page2/page2.component';

const routes: RouterConfig = [

  { path: 'page1', component: Page1Component },
  { path: 'page2', component: Page2Component },
  { path: '**', component: PageNotFoundComponent }
];

export const appRouterProviders = [
  provideRouter(routes)
];

Upon running the application with the npm start command, I encountered a warning (not an error). You can view the warning screenshot here.

Could you please guide me on how to resolve this warning?

typescriptangularangular2-routing

Answer №1

To improve your main AppComponent, consider including the following line:

  precompile: [Page1Component, Page2Component .... ]

Give it a try and let me know if this resolves your issue.

Answer №2

It seems there is a missing piece in the Angular 2 router documentation that will hopefully be addressed soon. In the meantime, you can refer to this particular answer for guidance. The most recent update to Angular 2 introduces a new precompile option within the @Component decorator. Following the warning's advice, make sure to include this in your app component.

@Component({
  selector: 'my-root-app-component',
  template: '...',
  precompile: [PageNotFoundComponent, PlusWhateverElseThrowsAWarning, Etc]
})

While Angular 2 has always precompiled components (which contributes to its magic), the introduction of the new router necessitates specifying which components should be precompiled. This optimization aims to enhance performance by only precompiling essential components upon startup.

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