Improve logic that chooses co- vs. contra-variant inferences #52123
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typescript-bot
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Author: Team
For Milestone Bug
ahejlsberg
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DanielRosenwasser,
jakebailey,
RyanCavanaugh and
weswigham
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@typescript-bot test this |
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Heya @jakebailey, I've started to run the tarball bundle task on this PR at 26902df. You can monitor the build here. |
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Heya @jakebailey, I've started to run the parallelized Definitely Typed test suite on this PR at 26902df. You can monitor the build here. |
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Heya @jakebailey, I've started to run the extended test suite on this PR at 26902df. You can monitor the build here. |
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Heya @jakebailey, I've started to run the diff-based user code test suite on this PR at 26902df. You can monitor the build here. Update: The results are in! |
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Heya @jakebailey, I've started to run the perf test suite on this PR at 26902df. You can monitor the build here. Update: The results are in! |
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Heya @jakebailey, I've started to run the diff-based top-repos suite on this PR at 26902df. You can monitor the build here. Update: The results are in! |
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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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I can confirm that this fixes all of my cast/assert issues on the SFT branch. Wonderful! |
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@jakebailey Here are the results of running the user test suite comparing Everything looks good! |
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Heya @jakebailey, I've run the RWC suite on this PR - assuming you're on the TS core team, you can view the resulting diff here. |
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@jakebailey Here are the results of running the top-repos suite comparing Everything looks good! |
RyanCavanaugh
approved these changes
Jan 6, 2023
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@jakebailey Here they are:
CompilerComparison Report - main..52123
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StartupComparison Report - main..52123
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Developer Information: |
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jakebailey
approved these changes
Jan 6, 2023
11 tasks
This was referenced Jan 6, 2023
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Another example that I didn't realize was affected is this: interface A {
a: string;
}
interface B extends A {
b: string;
}
interface C extends A {
c: string
}Then: declare function isC(x: A): x is C;
declare function every<T, U extends T>(array: readonly T[], callback: (element: T, index: number) => element is U): array is readonly U[];
declare function every<T, U extends T>(array: readonly T[] | undefined, callback: (element: T, index: number) => element is U): array is readonly U[] | undefined;
declare function every<T>(array: readonly T[] | undefined, callback: (element: T, index: number) => boolean): boolean;
function foo(arr: readonly B[] | readonly C[] | undefined) {
if (every(arr, isC)) {
arr;
}
}In TS 4.9, this code errors because it picks (I may send a PR for this test case too.) |
jakebailey
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to jakebailey/TypeScript
that referenced
this pull request
Jan 10, 2023
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I have another followup case that turned out to not be fixed (I also didn't catch it in the SFT branch in the same way as the above fixed case); I'll file a new issue. |
This was referenced Jan 10, 2023
jakebailey
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Fixes #52111.