Types inlined (duplicated) in declarations in the generated declaration file

[bugron]

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Comment

Hi there,
I'm working on a component library and there is a type generation behavior I don't quite understand.

Here is an example. Notice that ButtonProps in the .D.TS tab is inlined (duplicated) in the Button declaration.

I have another component that uses a type union in its prop types and I don't see the prop types being inlined in the component declaration there. So I tried this - no type inlining 🤷‍♂️

Also using an interface here seems to fix this issue too.

Could you please help me understand why the type inlining happened in the first example and how to avoid it without the weird T | T or using an interface?

Thanks in advance for any help 🙏

[robpalme]

Duplication of types in emitted DTS files is a well-known existing issue.

For projects that opt-in, it will be solved by Isolated Declarations.

[bugron]

Got it. Thanks @robpalme!