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withPreloading
function
Allows to configure a preloading strategy to use. The strategy is configured by providing a reference to a class that implements a PreloadingStrategy.
withPreloading(preloadingStrategy: Type<PreloadingStrategy>): PreloadingFeature
    Parameters
preloadingStrategy | 
        Type<PreloadingStrategy> | 
        A reference to a class that implements a   | 
       
Returns
PreloadingFeature: A set of providers for use with provideRouter.
See also
Usage notes
Basic example of how you can configure preloading:
const appRoutes: Routes = [];
bootstrapApplication(AppComponent,
  {
    providers: [
      provideRouter(appRoutes, withPreloading(PreloadAllModules))
    ]
  }
);
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Licensed under the Creative Commons Attribution License 4.0.
 https://angular.io/api/router/withPreloading