'TS2345: Argument of type x is not assignable to parameter of type y, x is extends y

I want to run the sigma.js\examples\custom-rendering example, when I run npm start, I got TS2345: Argument of type 'Graph<Attributes, Attributes, Attributes>' is not assignable to parameter of type 'AbstractGraph<Attributes, Attributes, Attributes>'. errors.

I find the Graph type declaration is the following.

export default class Graph<
  NodeAttributes extends Attributes = Attributes,
  EdgeAttributes extends Attributes = Attributes,
  GraphAttributes extends Attributes = Attributes
> extends AbstractGraph<NodeAttributes, EdgeAttributes, GraphAttributes> {}

declare abstract class AbstractGraph<
  NodeAttributes extends Attributes = Attributes,
  EdgeAttributes extends Attributes = Attributes,
  GraphAttributes extends Attributes = Attributes
> extends EventEmitter<NodeAttributes, EdgeAttributes, GraphAttributes> { ... }

It seems typescript does not accept Graph<Attributes, Attributes, Attributes> as an AbstractGraph<Attributes, Attributes, Attributes> instance. That's different from what I have learn in Java/C#.

What's wrong with it?

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'TS2345: Argument of type x is not assignable to parameter of type y, x is extends y

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