Comments (5)
I added an answer in the stackoverflow question. We need to make sure that these two lines remain valid after any fix.
const x = observable<false | undefined>(false);
const y = observable(false);
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For now the best I can offer is:
// Fixed
function observable<T, U = any>(value?: T extends infer R ? R : U): unknown extends T ? Observable<U> : Observable<T>
{
return undefined as any; // the implementation is not important
}
The playground contains many examples and seems OK, of course anybody can check and correct if needed, I am no expert in this.
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Thanks @maskmaster , @tomhanax the answer & playground are very helpful.
direct link to the SO question
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Hi, I believe I'm hitting the same issue when upgrading to typescript 4.6 but I might need some help understanding the workaround. Here is a minimum repro.
The ExtendedType
is clearly assignable to the BaseType
, but typescript wouldn't allow. Also, the error suggests that typescript is trying to assign BaseType
to ExtendedType
, which is opposite to the desired direction.
Should I manually patch the type definitely of KnockoutObservable
? I'm not sure how that might work. Thank you and let me know if I should cross post to other repos.
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This was fixed in TypeScript: microsoft/TypeScript#48380
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