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Type is not narrowed when inferring number-like string #48635

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graphemecluster opened this issue Apr 10, 2022 · 2 comments
Closed

Type is not narrowed when inferring number-like string #48635

graphemecluster opened this issue Apr 10, 2022 · 2 comments
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@graphemecluster
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Bug Report

Is this working as intended?

🔎 Search Terms

infer with extends

🕗 Version & Regression Information

New feature in 4.7.0

⏯ Playground Link

Playground link with relevant code

💻 Code

type foo = "42" extends `${infer T extends number}` ? T : never

🙁 Actual behavior

Type of foo is inferred as number.

🙂 Expected behavior

Type of foo is inferred as 42.
@jcalz
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jcalz commented Apr 10, 2022

It is working as intended until and unless #48094 is merged.

@graphemecluster
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Ah, OK. So this is a duplicate of #47141. Sorry for that.

@RyanCavanaugh RyanCavanaugh added the Duplicate An existing issue was already created label Apr 11, 2022
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@jcalz @RyanCavanaugh @graphemecluster