Microsoft/TypeScript
Index type for an intersected `NoInfer` can get sometimes incorrectly deferred
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#61,091 opened on 2025/01/31
Domain: Index TypesHelp WantedPossible Improvement
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説明
🔎 Search Terms
noinfer intersection index type keyof deferred deferral
🕗 Version & Regression Information
- This is the behavior in every version I tried
⏯ Playground Link
💻 Code
type Test = keyof (NoInfer<{ foo: string }> & {});
// ^? type Test = keyof (NoInfer<{ foo: string; }> & {})
type Test2 = keyof ({ foo: string } & {});
// ^? type Test2 = "foo"
🙁 Actual behavior
Test is a deferred index type
🙂 Expected behavior
Test shouldn't be a deferred index type but a "foo" literal, just like Test2.
Additional information about the issue
No response