What are the best practices for lazy loading in Angular?

What are the best practices for lazy loading in Angular?

Lazy loading in Angular helps improve performance by loading modules only when needed. Best practices include using the Angular Router to define lazy-loaded routes, organizing your modules effectively, and avoiding shared modules that can lead to unnecessary loading.

Can you explain how to implement lazy loading with the Angular Router?

Sure! To implement lazy loading with the Angular Router, you can use the loadChildren property in your route configuration. For example:

const routes: Routes = [
  { path: 'feature', loadChildren: () => import('./feature/feature.module').then(m => m.FeatureModule) }
];
``` This will load the `FeatureModule` only when the user navigates to the 'feature' path.

What are some common mistakes to avoid when using lazy loading?

Common mistakes include not properly configuring routes, overusing lazy loading for small modules, and failing to manage dependencies correctly. It's important to ensure that lazy-loaded modules are self-contained and do not rely on eagerly loaded modules.

How can I test lazy-loaded modules in Angular?

You can test lazy-loaded modules by using Angular's testing utilities. Make sure to import the lazy-loaded module in your test bed and use the RouterTestingModule to simulate routing. This allows you to verify that the module loads correctly when the route is activated.