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Why does the types returned by 'valueOf()' are incompatible with the type Partial<Temporal.PlainDate>?
[closed]
Closed as unclear by Karl Knechtel on Jun 7, 2025 at 21:23
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This code:
type A = Partial<Temporal.PlainDate>;
const a: A = { day: 1, month: 1, year: 2025 }
yields this error:
Type '{ day: number; month: number; year: number; }' is not assignable to type 'Partial<PlainDate>'.
The types returned by 'valueOf()' are incompatible between these types.
The 'Object' type is assignable to very few other types. Did you mean to use the 'any' type instead?
I expect the type check to pass. In my understanding, Partial<X> is a type with all properties of X set to optional, so a should have no error. If this is the intended restriction, then how can I create a Partial<Temporal.PlainDate> instance?
const a = new Temporal.PlainDate(2025, 1, 1) works. I just wonder why using Partial doesn't work here. Reading Temporal.PlainDate.prototype.valueOf() doesn't help.
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