Comments (6)
This is sort of a bug, but really more of a possible improvement. At any rate, during type inference in the instantiation of the Parameters<T>
conditional type, we attempt to resolve the return type of bar
without really needing to, which leads to a circularity. It's a pretty easy fix, I'll put up a PR.
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I would like to be able to infer type of a function A that calls another function B, returning its value, relying on parameters of function A (not sure if the description is good, see the code snippet).
I'm not 100% sure, but based on your description I think you're looking for #40179?
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@fatcerberus I think I'd still need to refer to the function type: paramsof typeof bar
what would cause the same problem.
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@ahejlsberg that's amazing! Honestly, I didn't expect to get this reaction seeing so many issues at this repo ❤️
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@ahejlsberg that's perfect! Thank you! I think many people would be happy to show their appreciation to you by sponsoring but unfortunately your sponsoring page is not set up. This update changes a lot in my code and solves a problem that I was having for very long time. Sorry for delayed reply, I didn't know how TS versioning works and just installed the PR version ❤️
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@ahejlsberg I'm doing some tests but still getting similar problems. Could you also check the following and more complex example:
function withSchmuck<T, R>(arg: T, handler: (arg2: T) => R) {
console.log(arg);
return handler;
}
const foo = withSchmuck('hello', (arg) => {
return bar(arg);
});
function bar(arg: Parameters<typeof foo>[0]) {
console.log(arg);
}
The arg
of bar
should have type of string
but TS says this is the same error as I got before. As in the previous case, nothing is trying to infer the return type, only arguments.
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- (JSDoc, JavaScript) Imported class types by require() are unresolved HOT 1
- Type all exported members according to some interface HOT 2
- JSDoc typed function comments inside functions
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- Type 'never' incorrectly inferred for mixed primitive type properties assignment with strictNullChecks disabled HOT 2
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- Support WebIDL interfaces nominally (not just structurally) HOT 9
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