Generated d.ts includes implicit any for recursive types

🔎 Search Terms

recursive any noImplicitAny d.ts

🕗 Version & Regression Information

• This is the behavior in every version I tried (3.3 through 5.2), and I reviewed the FAQ for entries about anything related to this.

⏯ Playground Link

playground link

💻 Code

const a = () => a;

🙁 Actual behavior

Any is implicitly introduced in the d.ts:

declare const a: () => any;

Note that the local type checking (not using the d.ts) correctly handles this recursive type without introducing "any", and builds fine with noImplicitAny enabled.

🙂 Expected behavior

Either generate something without implicitly introducing any, or generate an error if noImplicitAny is enabled.
In this case, the below code generation for the d.ts would work:

declare const a: () => typeof a;

Additional information about the issue

No response

Start with the linked Playground reproduction and compare the generated declaration for const a = () => a with the expected typeof a form. Trace the declaration-generation path for this recursive type and add or update a regression test for noImplicitAny. Done means recursive declarations no longer introduce implicit any, or an appropriate error is reported.