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The Web Components Community Group is developing such a format to describe the types of components here: https://github.com/webcomponents/custom-elements-manifest

People have already built tools that generate wrappers based on it.

Stencil has this feature btw: build a web component and it can output the strongly-typed React/Angular/Vue bindings to consume it natively in those frameworks.

Can you elaborate on this? Why can't you make a generator for regular web components?

You can, but knowing a certain property on the web component is an integer isn't easy with static analysis alone. Somehow you need some more rigid way to declare types to guarantee all generated components can be strongly typed.