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| og:image:alt | To review this it might be helpful to see how this evolved over time:
#27028
#46392
#52123
#52180
#54072
The reason why this inference fails today is that isTypeSubtypeOf leads to requireOptionalPr... |
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Add missing test coverage found in #57909
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Add nested call and new expressions as potential intra expression inference sites
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| TS playground | https://www.typescriptlang.org/play?ts=5.4.3#code/JYOwLgpgTgZghgYwgAgJLiqAzsBBRAGwgFsJwtkBvAKGWVAAcBXMALiuQDc4CmIB+dljCYQAc2QBfANy1kAIxZgA9iHaVkYAJ4MBQkaAkzqk6tVCRYiFACUIiMIRJkwAHgAKyALzI4ILQB8VHIMUMoMWOzusqbm4NDwSMgAIgDyALIAgmAGipAUNHQIABbABAAmUGSCyHYOTqTgyAA+yEwg5RAwoBDlMdTausgA0hBa3sjCohKtIEzE8tAtCsBiFrIWCdbI2bksEAVyANZjNaPjs0wEBMvtnd0gvf1xlokoAGLtCGDAqgDCymIDFULg8E0okiChWQAApQuFIsh3ABKdh1b4NFz9ToIAhwKrIXFwLAUAFAkHgDxQuQIVRTJjfZRQOFhCJo+zlVQELRU5H9TZWJJk4GPcB-PEksE+CHUuiPADusPhbKRqOQwopbncAVkdHucCuYHcrKwNXc+J+PCptw6XR6fRMZhxeIJMC+P1UhKqcEgmMpnggAA9IB0KGksjlMHkDgAaZAAFWQQZD5QofrAARhckGEH00xjIRNNRhuyj+woADJVcs5tdqGrOMpgA7nfiUG6QN9fiAvfZfURGlqk8GyKmqJCs3Qc+xPp2PSANaKtUFWouXOLiVhra0poYC3Rlab2CXI8Bo5Xq5c6w2mw6Xlsku8mfL8eU7DA8IHlD8EGv-bKlRNKI1XRRwByxORvU5EBuWQAASOCc2UGAhC0BZlAIXVkH1Q1jQRM0LWAK1tRte57WeHNkCfKAXygN8uk-b9cAAIWJCBrR8dxcCOVw5Go2j6I-L8fz-Zd92QE4tGQqjn1fd9GJEwERVBPxAmoHUzEo0T4x0djPGlSEJlEjdJRI1pZy7f4lM1KlZAGXTkAAKQAZQADXTAEQHpRkoA4uRWhhFkEWA7wglA9NkX82EFUA4Lqy8IJRNcVSAj5TSHNEvCIl4uhE2TUcKEk6T0AMLzcHTChWhc9zwLFOkRAZFRfJS9SJjykdQyctyPPqqBGqZVxQBgJZtTkfgkTkdh2pTQqxmKjBsHK2qwCwMa0AWsr8GWrAAG14wAXUm8c7Mo5ztCIcpMpNHL1WHGbJlKmZ1WspcdN0ZL-ACcTUjugrkGUeQACsIG+cTMl+zqipgXx-HE-TnvJJcsq3OQ6D+CGxyh9bSpwLbnHIZZtN0j7AmQcb0fYR5OGgOQAlanxUmIYAhyrVI40yDT7KGM6tAuq6EQAdWZ4pMhRtGMYoXdxEJl6XDe9iUu+iX-qBkGwDB5WsdUsGsHR-LOqlp6ifelKjPp5Aeb52XwGR1w-jjNmdiCKtoWJGpRfR1o7jtR4HWMe9BRQS3elE1isHYuQ9Y6sdDZlxG5eJxW5B+-WxwB4HvnBSQNdT2apOh1SJipmmglzmSaLkhjhJYtjXGDy7raNa77eQR2OYA1wPeV2PV0b+WSaCHw-kzVHkEPdh6-5iIhbAEWtw9h32fZ3W6boED7AxZa6-OkPG+Rme5873XF52Zfh402JTp3hv48pSPNbm6GStEXGKrj5TwH7pO6BT6OKHTtWWcc5-wko-GG4wfDFygObWOVZJ6NzDuxFubdOatgJLSLyYBkDMSUKoCe18kpyAAER5BUCAIh4loR0COKAcoNQiGhGAMQfEWgiHLCIeHDB5QWFsK9raB4Tw5DZzkFA9SdkEDen7PjMAMIcE5FUHGDQNCOjsCIfKMI0tuCYD8GANhkg0rUCDMCKAWCISyCAA |
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Mar 25, 2024
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[react] React 18 types
DefinitelyTyped/DefinitelyTyped#56210
| https://github.com/DefinitelyTyped/DefinitelyTyped/pull/56210 |
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| March 25, 2024 21:12 | https://github.com/microsoft/TypeScript/pull/57909#commits-pushed-6688f3c |
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| Merge remote-tracking branch 'origin/main' into tweak-co-contra-infer… | https://github.com/microsoft/TypeScript/pull/57909/commits/6688f3cd5d4634a7f0be4f5893521bdf9f413648 |
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| Merge remote-tracking branch 'origin/main' into tweak-co-contra-infer… | https://github.com/microsoft/TypeScript/pull/57909/commits/03d0eb1533d9cd3d90b51db3cded051e1a35179f |
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| May 9, 2024 | https://github.com/microsoft/TypeScript/pull/57909#issuecomment-2102819314 |
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Jun 14, 2024
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View reviewed changes
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Jun 14, 2024
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View reviewed changes
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| src/compiler/checker.ts | https://github.com/microsoft/TypeScript/pull/57909/files/b715e323b6d0b6331ad791bea2e25a2f3dc6303c#diff-d9ab6589e714c71e657f601cf30ff51dfc607fc98419bf72e04f6b0fa92cc4b8 |
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| Merge remote-tracking branch 'origin/main' into tweak-co-contra-infer… | https://github.com/microsoft/TypeScript/pull/57909/commits/1c3f6c952fc9d095342e9ebbcfa189fb61ed6dac |
| 1c3f6c9 | https://github.com/microsoft/TypeScript/pull/57909/commits/1c3f6c952fc9d095342e9ebbcfa189fb61ed6dac |
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Jun 14, 2024
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View reviewed changes
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| Jun 17, 2024 | https://github.com/microsoft/TypeScript/pull/57909#event-13192332148 |
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Aug 16, 2024
| https://github.com/microsoft/TypeScript/pull/57909#ref-issue-2470710460 |
|
5.6 regression: Incorrect param type inference for type with all optional props
#59656
| https://github.com/microsoft/TypeScript/issues/59656 |
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| Aug 21, 2024 | https://github.com/microsoft/TypeScript/pull/57909#issuecomment-2301715718 |
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Improve logic that chooses co- vs. contra-variant return type inferences
#59709
| https://github.com/microsoft/TypeScript/pull/59709 |
|
The order of values in a union affects the correct type inference
#59729
| https://github.com/microsoft/TypeScript/issues/59729 |
| https://github.com/trevorade |
| trevorade | https://github.com/trevorade |
|
Aug 23, 2024
| https://github.com/microsoft/TypeScript/pull/57909#ref-issue-2483814068 |
|
Google feedback on TS 5.6-beta
#59733
| https://github.com/microsoft/TypeScript/issues/59733 |
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Aug 26, 2024
| https://github.com/microsoft/TypeScript/pull/57909#ref-issue-2487631207 |
|
5.6 regression: Array.prototype.reduce type inference regression
#59763
| https://github.com/microsoft/TypeScript/issues/59763 |
| https://github.com/RyanCavanaugh |
| RyanCavanaugh | https://github.com/RyanCavanaugh |
|
Aug 27, 2024
| https://github.com/microsoft/TypeScript/pull/57909#ref-issue-2487840144 |
|
5.6 regression: Inference with mixed in type intersection no longer compiles
#59765
| https://github.com/microsoft/TypeScript/issues/59765 |
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| August 27, 2024 05:50 | https://github.com/microsoft/TypeScript/pull/57909#event-14022463029 |
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Aug 27, 2024
| https://github.com/microsoft/TypeScript/pull/57909#ref-pullrequest-2488692193 |
|
Tweak logic that chooses co- vs. contra-variant inferences when covariant inference is an empty object type
#59772
| https://github.com/microsoft/TypeScript/pull/59772 |
| https://github.com/trevorade |
| trevorade | https://github.com/trevorade |
| Aug 27, 2024 | https://github.com/microsoft/TypeScript/pull/57909#issuecomment-2312826761 |
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Sep 26, 2024
| https://github.com/microsoft/TypeScript/pull/57909#ref-issue-2551523755 |
|
Inferred type changes from 5.5 to 5.6
#60077
| https://github.com/microsoft/TypeScript/issues/60077 |
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| PR Backlog | https://github.com/orgs/microsoft/projects/1252 |
| Apr 22, 2025 | https://github.com/microsoft/TypeScript/pull/57909#event-17355391801 |
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| Oct 16, 2025 | https://github.com/microsoft/TypeScript/pull/57909#event-20323076635 |
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weswigham
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| https://github.com/microsoft/TypeScript/pull/57909/files/b715e323b6d0b6331ad791bea2e25a2f3dc6303c |
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jakebailey
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| https://github.com/microsoft/TypeScript/pull/57909/files/169d720b7e7cea509b019e1a5c309e5e8075d2f2 |
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jakebailey
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For Backlog Bug
| https://github.com/microsoft/TypeScript/issues?q=state%3Aopen%20label%3A%22For%20Backlog%20Bug%22 |
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.call on an union with different arguments counts fails when passing any
| https://github.com/microsoft/TypeScript/issues/58468 |
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Contravariant inference gets picked when a a better covariant candidate exists
| https://github.com/microsoft/TypeScript/issues/57908 |
| Please reload this page | https://github.com/microsoft/TypeScript/pull/57909 |
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