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Hey Shad! Let me answer that in parts :)

what are the benefits

Testing components of a design system is similar to testing components of any product. It helps you avoid bugs and keep the overall quality high.

what concerns do we need to keep in mind

What's probably unique to components as part of your design system is:

1. these components need to provide a solid base to build things on top of. So if your components aren't responsive or accessible, it would be difficult to make a responsive or accessible product on top of it. Those are great tests to have.

2. you get a suite of scenarios and tests from the use cases of your components. When a component is used in a way that you did not predict, that can be brought back as a test suite.

And for your second question about typescript, I'd love for others to chime in on this one, I'm pretty new to typescript.

From my limited experience of using typescript for reusable components, it forces you to be accurate about the definition and usage of every variable/function/component which brings up edge cases that you wouldn't have thought of otherwise (example: can user.name be null, what should we render then?)

Personally, I'm just a fan of autocomplete for discoverability :)

Understood. Thanks for answering Sid