Filter return type inferences by constraint applicability #58910
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Andarist
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weswigham
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src/compiler/checker.ts
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| } | ||
| else { | ||
| if (inference.priority! & InferencePriority.ReturnType) { | ||
| inference.inferredType = filterContextualInferredType(inferredType, instantiatedConstraint) ?? (fallbackType && filterContextualInferredType(fallbackType, instantiatedConstraint)) ?? instantiatedConstraint; |
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We only need to bother with this filtering if the constraint check for the whole union fails, right? (Since if it passes, no filtering will occur, as every union member must also pass.) This can probably be inside the comparison branch below?
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That’s right but it felt cleaner to have this in a separate branch. Shouldnt filterType already optimize for array/type allocations?
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@typescript-bot test it |
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Hey @jakebailey, the results of running the DT tests are ready. There were interesting changes: Branch only errors:Package: jest |
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@jakebailey Here are the results of running the user tests with tsc comparing Something interesting changed - please have a look. Details
|
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@jakebailey Here they are:
tscComparison Report - baseline..pr
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@jakebailey Here are some more interesting changes from running the top 400 repos suite Details
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This had a ton of breaks on the extended tests, so seems like not a good idea? |
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yep, might not be a good idea after all - I didn't yet look at those breaks though, at the very least I'd like to get some new test cases based on them so we could add them to |
…-type-inference-by-constraint-applicability
Contributor
Author
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Slimmed down repro based on type Query = (
container: HTMLElement,
...args: any[]
) =>
| Error
| HTMLElement
| HTMLElement[]
| Promise<HTMLElement[]>
| Promise<HTMLElement>
| null;
interface Queries {
[T: string]: Query;
}
type FindByText<T extends HTMLElement = HTMLElement> = (
container: HTMLElement,
text: string,
) => Promise<T>;
declare function findByLabelText<T extends HTMLElement = HTMLElement>(
...args: Parameters<FindByText<T>>
): ReturnType<FindByText<T>>;
const queries = {
findByLabelText,
};
type MapQueries<Q extends Queries = typeof queries> = {
[P in keyof Q]: Q[P];
};I didn't quite expect a change in any code like this... I'll continue investigating this. |
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@typescript-bot test it |
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@typescript-bot test it |
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Collaborator
|
Hey @jakebailey, the results of running the DT tests are ready. Everything looks the same! |
Collaborator
|
@jakebailey Here are the results of running the user tests with tsc comparing Something interesting changed - please have a look. Details
|
Collaborator
|
@jakebailey Here they are:
tscComparison Report - baseline..pr
System info unknown
Hosts
Scenarios
Developer Information: |
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@jakebailey Here are the results of running the top 400 repos with tsc comparing Everything looks good! |
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|
@gabritto I made a very silly mistake initially. It was somewhat a coincidence that the tests I had passed 😅 This was fixed now and I added extra test cases. The PR is now in a good state and can be reviewed :) Above we can see some missing implicit anys in webpack. I added a test case based on that, this is a clear improvement. |
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Aside from the new return type branch, it seems like this also changes the |
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No, that wasn't intentional. Thanks for pointing that out - I corrected the PR but I doubt it will make a difference for any of the extended tests. |
…-type-inference-by-constraint-applicability
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@gabritto @weswigham friendly 🏓 :) |
…-type-inference-by-constraint-applicability
…-type-inference-by-constraint-applicability
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@typescript-bot test it |
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Hey @jakebailey, I've packed this into an installable tgz. You can install it for testing by referencing it in your and then running There is also a playground for this build and an npm module you can use via |
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Just to note it, this code now matches the fix that Anders applied separately in the Go codebase, so this should be good as-is now, yay. |
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Hey @jakebailey, the results of running the DT tests are ready. Everything looks the same! |
Collaborator
|
@jakebailey Here are the results of running the user tests with tsc comparing There were infrastructure failures potentially unrelated to your change:
Otherwise... Everything looks good! |
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|
@jakebailey Here they are:
tscComparison Report - baseline..pr
System info unknown
Hosts
Scenarios
Developer Information: |
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@jakebailey Here are the results of running the top 400 repos with tsc comparing Something interesting changed - please have a look. Details |
jakebailey
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Dec 3, 2025
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Cross comparing typescript-go, and this is matching.
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Andarist
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fixes #50719
fixes #41461
fixes #57905