[Typescript Challenges] 145 Medium - Public Type

Remove the key starting with _ from given type T.

/* _____________ Your Code Here _____________ */

type PublicType<T extends object> = {
  [Key in keyof T as Key extends `_${string}` ? never: Key]: T[Key]
}

/* _____________ Test Cases _____________ */
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<PublicType<{ a: number }>, { a: number }>>,
  Expect<Equal<PublicType<{ _b: string | bigint }>, {}>>,
  Expect<Equal<PublicType<{ readonly c?: number }>, { readonly c?: number }>>,
  Expect<Equal<PublicType<{ d: string; _e: string }>, { d: string }>>,
  Expect<Equal<PublicType<{ _f: () => bigint[] }>, {}>>,
  Expect<Equal<PublicType<{ g: '_g' }>, { g: '_g' }>>,
  Expect<Equal<PublicType<{ __h: number; i: unknown }>, { i: unknown }>>,
]