How to inherit from the typing without inheriting the "any"?

[paul23-git]

Introduction

I am in the process of writing a (small) library to provide a more declarative way to describe diagrams, for react like environments.

Instead of pumping everything into a useEffect manually the goals is to have something like:

<Paper width={300} height={300} background={{ color: '#F5F5B5' }} cellViewNamespace={namespace}>
    <Rect x={100} y={150} width={80} height={40} callbackState={rect1}/>
    <Rect x={100} y={210} width={80} height={40} callbackState={rect2}/>
    <Link source={rect1[0]} target={rect2[0]} />
</Paper>

Now in that proces I was trying to specify the props for Link/Rect. Not wishing to completely reinvent the wheel myself, I Tried to make due with the types already supplied by jointjs: shapes.standard.LinkAttributes

While this works, I also notice that all my typing stopped giving warnings when I used or gave unsupported attributes. Anything can be supplied and is then defined as "any".

I noticed that this is due to the typing from dia.Cell.GenericAttributes which has:

    interface GenericAttributes<T> {
        attrs?: T;
        z?: number;
        [key: string]: any;
    }

Why is that is that line in there? Can we remove that when I inherit from that?

Steps to reproduce

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Restrictions & Constraints

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JointJS