Implement a type DeepPick, that extends Utility types Pick.
A type takes two arguments.
For example:
type obj = {
name: 'hoge',
age: 20,
friend: {
name: 'fuga',
age: 30,
family: {
name: 'baz',
age: 1
}
}
}
type T1 = DeepPick<obj, 'name'> // { name : 'hoge' }
type T2 = DeepPick<obj, 'name' | 'friend.name'> // { name : 'hoge' } & { friend: { name: 'fuga' }}
type T3 = DeepPick<obj, 'name' | 'friend.name' | 'friend.family.name'> // { name : 'hoge' } & { friend: { name: 'fuga' }} & { friend: { family: { name: 'baz' }}}
import type { Equal, Expect } from '@type-challenges/utils'
type Obj = {
a: number
b: string
c: boolean
obj: {
d: number
e: string
f: boolean
obj2: {
g: number
h: string
i: boolean
}
}
obj3: {
j: number
k: string
l: boolean
}
}
type cases = [
Expect<Equal<DeepPick<Obj, ''>, unknown>>,
Expect<Equal<DeepPick<Obj, 'a'>, { a: number }>>,
Expect<Equal<DeepPick<Obj, 'a' | ''>, { a: number } & unknown>>,
Expect<Equal<DeepPick<Obj, 'a' | 'obj.e'>, { a: number } & { obj: { e: string } }>>,
Expect<Equal<DeepPick<Obj, 'a' | 'obj.e' | 'obj.obj2.i'>, { a: number } & { obj: { e: string } } & { obj: { obj2: { i: boolean } } }>>,
]