Comments (6)
Since this seems to be a valid use-case, how would we feel about PRing OptionalKeys in separately to #56?
Sure, but if we add OptionalKeys
, we should probably also add RequiredKeys
.
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What problem are you trying to solve? Why do you need to get the optionals?
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Specifying what the optional defaults should be.
from type-fest.
@WORMSS You're probably looking for OptionalKeys
, as discussed here #56 (comment)
@sindresorhus Since this seems to be a valid use-case, how would we feel about PRing OptionalKeys
in separately to #56?
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Also, as for specifying the defaults, if they're all the same, you can do this.
type AWithDefaults = Omit<A, OptionalKeys<A>> & Record<OptionalKeys<A>, Default>;
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+1 for OptionalKeys
and RequiredKeys
.
I didn't mind the learning exercise before I found this ticket, but it would have been nice to have it in the library!
My solution was
type OptionalKeys <T> = {
[K in keyof T]: Pick<Partial<T>, K> extends Pick<T, K> ? K : never
}[keyof T]
Happy to PR, but maybe @resynth1943's answer from #56: {} extends Pick<T, K> ? K : never
is nicer.
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Related Issues (20)
- IfAny circular constraint in TS 5.4+ HOT 2
- Make the second argument to RequireAllOrNone optional HOT 1
- Use `NoInfer`?
- Type for serializable objects? HOT 3
- Proposal: SetKeyRequired with key required, but allow undefined value HOT 2
- OverrideProperties changes undefined as optional HOT 2
- Exclude / Pick type in Paths / only add leaf nodes HOT 2
- `Proposal`: add option with exclude/keep specified type on deep type HOT 5
- Unify `Get` and `Paths` / `PickDeep` etc HOT 1
- `Paths` is unable to escape dots in property names
- DistributedOmit may not need to constraint the second type argument HOT 6
- A type util to produce an alternation of function overloads. HOT 1
- PositiveIntegerString type HOT 4
- Type-fest based prelude HOT 1
- ArrayExceptLastElement type HOT 7
- Zero is not exported by ... HOT 1
- `And` and `Or` is not exported at `index.d.ts`
- ConditionalKeys does not correctly filter out `never` type HOT 3
- Paths<T> should handle recursive types
- `PickDeep` strips `null` HOT 7
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