Type Alias IsOptionalKey<T, K, Then, Else>

IsOptionalKey: K extends OptionalKeys<T> ? Then : Else

Validate if the key K in T is optional.

🎭 predicate

Type Parameters

T
K
Then = true
Else = false

Example

IsOptionalKey({ a: 1 }, 'a') // false
IsOptionalKey({ a?: 1 }, 'a') // true