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generics that extend conditional types that use another generic don't work #41743

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DetachHead opened this issue Dec 1, 2020 · 1 comment
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generics that extend conditional types that use another generic don't work #41743

DetachHead opened this issue Dec 1, 2020 · 1 comment
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@DetachHead
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DetachHead commented Dec 1, 2020 •
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TypeScript Version: 4.2.0-dev.20201201

Search Terms:
Conditional types generics
Code

interface Foo<T, U extends T extends number? any: any> {}
function foo<T>(bar: Foo<T, number>) {}

Expected behavior:
No error, U is any
Actual behavior:
Error 2344: Type 'number' does not satisfy the constraint 'T extends number? any: any'
Playground Link:
https://www.typescriptlang.org/play?ts=4.2.0-dev.20201201#code/JYOwLgpgTgZghgYwgAgGIHt0B4AqAaZAVWQgA9IQATAZ2RxPIitpAFcBbAI2gH5k4QATwBc-IQD5kAbwC+AWABQMViARhg6EMhiZc4gBSc4UURmz5kbLtHEBKaTKA
Related Issues:
Maybe #41040 ?
@DetachHead DetachHead changed the title generics that extend conditional types that use another generic don't worm generics that extend conditional types that use another generic don't work Dec 1, 2020
@RyanCavanaugh
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Looks like a duplicate of #30639

@RyanCavanaugh RyanCavanaugh added the Duplicate An existing issue was already created label Dec 1, 2020
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@RyanCavanaugh @DetachHead