utilizing type predictors in brand merging

For hours now, I've been struggling with a small problem that seems to have no solution in sight. I wonder if someone with a sharper mind could offer me some guidance?

  • The method I'm using returns a predicate: this is xxx.
  • This method is then used in conjunction with a branding.

Despite everything working as intended, one final error is eluding me. Could this be a limitation of TypeScript?

Although everything is functioning the way I want, this one issue is driving me mad! If anyone has any ideas on how to tackle this last hurdle in my code, please see: 🔴.

I've tried to simplify the example as much as possible.

Thank you for your assistance.

...

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typescripttypescript-genericsentity-component-system

Answer â„–1

The issue stemmed from a limitation in the use of type that does not handle this.

It appears that Interfaces do support the use of this, enabling branding to function properly.

By substituting type with interface, the branding process now works as intended.

type EntityWith<
    C extends Component,
    R extends ComponentType = never,
    E extends Entity = Entity,
> = E & {
    has<T extends R>(componentType: T): boolean
}

which is replaced by

interface EntityWith<
    C extends Component,
    R extends ComponentType = never,
> extends Entity {
    has< T extends R>( componentType: T ): this is Entity<InstanceType<T>, []>
}

Now the method within the class is reflected correctly

abstract class Entity {
    declare has: <T extends RemoveSuper<M>>(componentType: T) => this is Entity<InstanceType<T>, []>
}

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