Issue encountered: "Cannot determine type of object" message received while utilizing graphql-codegen in an Angular project

I am currently working on an Angular application that uses graphql-codegen to automatically generate models based on the GraphQL endpoint.

Within the component, there is an image tag enclosed in a container:

<ng-container *ngFor="let blog of (blogPosts | async)?.blogPost  | paginate: config">
    <img class="image" *ngIf="blog.image.urls" src="http://localhost:5002{{blog.image.urls}}"
                        alt="Placeholder image">
</ng-container>

When compiling the code, I encounter errors related to (blogPosts | async)?.blogPost and the image part of the blog. The former error states:

Argument of type '({ __typename?: "BlogPost" | undefined; path: string; subtitle?: string | null | undefined; displayText?: string | null | undefined; owner: string; publishedUtc?: any; markdownBody?: { ...; } | ... 1 more ... | undefined; image?: { ...; } | ... 1 more ... | undefined; } | null)[] | null | undefined' is not assignable to parameter of type 'Collection<unknown>' 

And the latter error message reads:

Object is of type 'unknown'

The TypeScript section of the component includes a GraphQL query generated by the graphql-codegen library:

import { Component, OnInit } from '@angular/core';
// other imports...

@Component({
  selector: 'app-blog',
  templateUrl: './blog.component.html',
  styleUrls: ['./blog.component.scss']
})
export class BlogComponent implements OnInit {
  // component properties...
}

// other component methods...

In the snippet above, you can see that BlogPostsGQL is responsible for fetching data in the blog component. Here is its corresponding code:

// BlogPostsGQL code here...

The required packages for this application include:

// package dependencies listed here...

If you have any suggestions on how to resolve these errors, please let me know!

Thank you!

Answer №1

There is a clear inconsistency in type checking between the Blogpost type and its reassignment later in the code.

To prevent type-checking errors without resolving the type inconsistency, you can use:

$any((blogPosts | async)...

The documentation explains the purpose of $any for improving readability:

Use the $any() type-cast function in certain contexts to opt out of type-checking for part of an expression

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