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Generic return type #43568

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MarvelSQ opened this issue Apr 7, 2021 · 2 comments
Closed

Generic return type #43568

MarvelSQ opened this issue Apr 7, 2021 · 2 comments
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Duplicate An existing issue was already created

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@MarvelSQ
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MarvelSQ commented Apr 7, 2021

Bug Report

🔎 Search Terms

Generic with condition

🕗 Version & Regression Information

version 4.2.3

⏯ Playground Link

Playground link with relevant code

💻 Code

type Maybe<T, F = null> = T extends never ? F : T;

// 'null'
type A = never extends never ? null : never;

// 'never'
type B = Maybe<never, null>;

🙁 Actual behavior

type A is null
type B is never

🙂 Expected behavior

type A & type B both are null
@whzx5byb
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whzx5byb commented Apr 7, 2021

Duplicate of #31751

@andrewbranch andrewbranch added the Duplicate An existing issue was already created label Apr 7, 2021
@MarvelSQ
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MarvelSQ commented Apr 9, 2021

Duplicate of #31751

thanks

@MarvelSQ MarvelSQ closed this as completed Apr 9, 2021
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@andrewbranch @whzx5byb @MarvelSQ