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Contextual parameter types failed to be provided based on filtering mapped typesΒ #56881

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@Andarist

Description

@Andarist

πŸ”Ž Search Terms

contextual parameter filtering mapped type inference generic

πŸ•— Version & Regression Information

  • This is the behavior in every version I tried

⏯ Playground Link

https://www.typescriptlang.org/play?ts=5.4.0-dev.20231226#code/CYUwxgNghgTiAEAzArgOzAFwJYHtVIEYAeAFXhAA8MRVgBneHAIwCtwMA+ACgCh55gUDFABc8EgBo+8ABZRaEEDDpiA3vADaABXhZ8AaxABPHInHwoDLQF0xXAG5QIyEGJLbrE+AAcYOb2JaAJTwALwc8PY4WMDwAL5SQWJRMQDcPDyIBLz8qtL8iDg4YgAMUvz8TLBiAEQ15fENeRVIRXaOziBehkYh4fCqCfnwVTDtTi7dxn0Rgw1DQek8oJCwCCjo2HhIAEyk5FQ09Iys7NzSgsJuDXIKSioDmjp68D2m5pbiHgfUtAx0GBgegA5vAAPzwHRiVAgexKWzwBwTVxfGxeXz+QIzSLRWILZK4paIHY5AbDQrFeBlYajWr1aRDXI06qIjqTV7TMKzRmNHiLIA

πŸ’» Code

declare function f1<T extends object>(
  data: T,
  handlers: { [P in keyof T as P]: (value: T[P], prop: P) => void },
): void;

f1(
  {
    foo: 0,
    bar: "",
  },
  {
    foo: (value, key) => {},
    bar: (value, key) => {},
  },
);

declare function f2<T extends object>(
  data: T,
  handlers: { [P in keyof T as T[P] extends string ? P : never]: (value: T[P], prop: P) => void },
): void;

f2(
  {
    foo: 0,
    bar: "",
  },
  {
    bar: (value, key) => {},
  },
);

πŸ™ Actual behavior

All of those functions report:

Parameter 'value' implicitly has an 'any' type.(7006)

πŸ™‚ Expected behavior

I'd expect all of those parameters to be contextually typed without problems.

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    Help WantedYou can do thisPossible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some cases

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