Method pick

repos/effect/packages/effect/src/Optic.ts:796–796

* Focuses on a subset of keys of the current struct focus. * * **Details** * * - On a Lens, returns a Lens. * - On an Optional, returns an Optional. * - Does **not** work on union types (compile error). * * **Example** (Picking keys) * * ```ts * impor

(
    this: Lens<S, A>,
    keys: Keys,
    ..._err: ForbidUnion<A, "cannot use `pick` on a union type">
  )

   *
   * @since 4.0.0
   */
  notUndefined<S, A>(this: Prism<S, A>): Prism<S, Exclude<A, undefined>>
  notUndefined<S, A>(this: Optional<S, A>): Optional<S, Exclude<A, undefined>>