Fresh {} is subtype of object
#49503
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typescript-bot
added
Author: Team
For Milestone Bug
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@typescript-bot test this |
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Heya @ahejlsberg, I've started to run the diff-based user code test suite on this PR at 26df65a. You can monitor the build here. Update: The results are in! |
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Heya @ahejlsberg, I've started to run the parallelized Definitely Typed test suite on this PR at 26df65a. You can monitor the build here. |
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Heya @ahejlsberg, I've started to run the extended test suite on this PR at 26df65a. You can monitor the build here. |
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Heya @ahejlsberg, I've started to run the abridged perf test suite on this PR at 26df65a. You can monitor the build here. Update: The results are in! |
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@ahejlsberg Here they are:Comparison Report - main..49503
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@ahejlsberg |
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Heya @ahejlsberg, I've run the RWC suite on this PR - assuming you're on the TS core team, you can view the resulting diff here. |
RyanCavanaugh
approved these changes
Jun 13, 2022
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What is going on with xstate emit time? @typescript-bot perf test this |
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Heya @DanielRosenwasser, I've started to run the perf test suite on this PR at 26df65a. You can monitor the build here. Update: The results are in! |
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@DanielRosenwasser Here they are:Comparison Report - main..49503
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weswigham
approved these changes
Jun 13, 2022
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@DanielRosenwasser is a small drop (2-4%) in XState's emit time concerning here? 🤔 Or do I read those reports all wrong? |
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I don't know why it's showing a drop, the emit time is identical; only the variability has shrunk if I've understood it correctly (@weswigham @rbuckton) |
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It looks like total time has improved (i.e., is lower) across the board. |
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There's a Stack Overflow question that seems to be related to this PR: interface Baz {
foo: { a: number };
}
const createDefaultExample = <K extends keyof Baz>(x: K): Baz[K] & { x: K; } => {
return { a: 0, x }; // okay in TS4.7, error in TS4.8
}Looks like the fix for #49520 might have broken this. Is it a bug and should this be filed as such? Or is it intended in some way? EDIT: Looks like the above was fixed by #50261 but this one persists: type Foo<K> = K extends unknown ? { a: number } : unknown
const createDefaultExample = <K,>(x: K): Foo<K> & { x: K; } => {
return { a: 1, x: x }; // okay in TS 4.7.4, error in TS 4.8.2
}Same question, I guess... bug? Not bug? New issue? |
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Fixes #49480.
Fixes #49520.