The specified type '<T>' cannot be assigned to type '<V>'. The '<T>' type is missing an index signature

Hello, I am currently working on implementing strictTemplate in my Angular codebase and encountering some challenges while defining the types for my models.

Below are the models I have:

export class User {
   public 'name'!: Filter<string>;
   public 'email'!: Filter<string>;
   public 'age':!: Filter<number>
}

export class Engine {
   public 'weight'!: Filter<number>;
   public 'isRunning'!: Filter<boolean>;
}

export class Filter<T> {
  public 'value'!: T;
  public 'isSortedAscending'?: boolean;
}

This is the component where either Engine or User will be passed as input:

@Component(
   selector: 'app-table',
   templateUrl: './table.component.html',
)
export class TableComponent 
{
   @Input()
   public sort: TableSortModel

   ....Omitted details for simplicity
}

export class  TableSortModel {
  [key: string]: Filter<unknown>;
}

Please note that besides Engine and User, there are other models being passed in my application, all with properties defined to use the Filter type.

The errors I'm encountering are:

Type 'Engine' is not assignable to type 'TableSortModel'. Index signature is missing in type 'Engine'.

Type 'User' is not assignable to type 'TableSortModel'. Index signature is missing in type 'User'.

I believe the index signature refers to [key: string]: Filter.

My question is, how should I define my TableSortModel so that it can accept both Engine and User classes?

Answer №1

Utilizing interfaces can be quite beneficial.

export class Filter<T> {
  public "value"!: T;
  public "isSortedAscending"?: boolean;
}

export interface User extends TableSortModel {
  name: Filter<string>;
  email: Filter<string>;
  age: Filter<number>;
}

export interface Engine extends TableSortModel {
  weight: Filter<number>;
  isRunning: Filter<boolean>;
}

export interface TableSortModel {
  [index: string]: Filter<unknown>;
}

Example

https://stackblitz.com/edit/angular-ivy-tnrss5?file=src/app/index.ts

export class AppComponent implements OnInit {
  item: TableSortModel;

  ngOnInit() {
    this.item = {
      age: new Filter<number>()
    } as User;
  }
}
export class SortDemoComponent implements OnInit {
  @Input()
  public sort: TableSortModel;

  constructor() {}

  ngOnInit() {}
}

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