Angular service providing components (TypeScript error)

This is my first time trying to dynamically inject components and so far, I've been successful. However, there's an error in Typescript that's bothering me (I don't like having errors in my code).

If you want to check out the app, here's the link: https://stackblitz.com/edit/angular-vrtr51?embed=1&file=src/app/app.component.ts

My aim was to create a service that can provide any component I need so that I can inject it from anywhere (especially for a widget-based website).

However, I'm seeing this error message in the console: error TS2339: Property 'data' does not exist on type '{}'.

You can find this error in app.component.ts at line 35.

The code is functioning properly, but I'd like to understand why this error is occurring.

Thank you!

angulartypescript

Answer №1

const componentFactory = this.resolver.resolveComponentFactory(this.componentProvider.get('header'));

Upon examining the type of componentFactory, you will find that it is ComponentFactory<{}>. This is due to the service returning a type of any when fetching the component type.

export class ComponentProviderService {
  public get(id): any {
    console.log(this.componentMap[id]);
    return this.componentMap[id];
  }
}

On line 30, by creating the component using componentFactory's type, which is implicitly ComponentFactory<{}>, the resulting comRef is of type ComponentRef<{}>. The error arises from the property instance having a type of {}.

To resolve this issue, replace line 29 with 

const componentFactory = this.resolver.resolveComponentFactory(HeaderComponent);

With this change, componentFactory now has an explicit type of 

ComponentFactory<HeaderComponent>
, resulting in comRef being of type 
ComponentRef<HeaderComponent>
and the property instance being of type HeaderComponent.

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