fix(theme): prevent empty Type Parameters heading and don't appear in callable interface

[moshams272]

Summary

TypeDoc stores the function arguments of a Callable Interface inside the typeParameters property, that makes no sense as it should under Call Signature heading (if it has multiple signatures) not Type Parameters heading.

This PR solves that and prevent empty Type Parameters heading.

Before:

After:

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Project	Deployment	Actions	Updated (UTC)
webpack-doc-kit	Ready	Preview, Comment	Jul 14, 2026 6:10am

[avivkeller]

Would you mind updating our type generator to not waltz around TypeScript and just output an opening bracket ({) followed by the complete TypeScript type, followed by a closing bracket (}), which'll be supported in nodejs/doc-kit#887

[avivkeller]

that should fix all our issues, since we won't need to reconstruct the types with our own emitter, and we can just rely on typedoc (right?)

[avivkeller]

In the mean time, LGTM. Feel free to do my suggestion here or in a follow-up, thank you!

[moshams272]

Would you mind updating our type generator to not waltz around TypeScript and just output an opening bracket ({) followed by the complete TypeScript type, followed by a closing bracket (}), which'll be supported in nodejs/doc-kit#887

Awesome, Thanks for your hard work 🤍

I'll open a follow-up to isolate things :)