Skip to content

Generic inference does not work as expected #60933

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
uriva opened this issue Jan 8, 2025 · 1 comment
Closed

Generic inference does not work as expected #60933

uriva opened this issue Jan 8, 2025 · 1 comment

Comments

@uriva
Copy link

uriva commented Jan 8, 2025

🔎 Search Terms

type GenericGeneric<S> = <T extends S>(x: T) => T;
type GenericNumber = <T extends number>(t: T) => T;
type ExpectedTrue = GenericNumber extends GenericGeneric<infer _> ? true : false;

I expect the last type to be true but it's false

🕗 Version & Regression Information

  • This is the behavior in every version I tried, and I reviewed the FAQ for entries about generics

⏯ Playground Link

No response

💻 Code

type GenericGeneric<S> = <T extends S>(x: T) => T;
type GenericNumber = <T extends number>(t: T) => T;
type ExpectedTrue = GenericNumber extends GenericGeneric<infer _> ? true : false;

🙁 Actual behavior

it's false

🙂 Expected behavior

should be `true

Additional information about the issue

No response

@jcalz
Copy link
Contributor

jcalz commented Jan 8, 2025

The title is quite vague. The search terms and playground link are missing.

Looks like a duplicate of #41040

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
None yet
Projects
None yet
Development

No branches or pull requests

2 participants