Function pick

packages/effect/src/Context.ts:1226–1235

(
  ...services: S
)

 * @since 2.0.0
 */
export const pick = <S extends ReadonlyArray<Key<any, any>>>(
  ...services: S
) =>
<Services>(self: Context<Services>): Context<Services & Service.Identifier<S[number]>> => {
  const keep = new Set(services.map((key) => key.key))
  return withFlat(self, (map) =>
    map.forEach((_, key) => {
      if (!keep.has(key)) map.delete(key)
    }))
}

/**
 * Returns a new `Context` with the specified service keys removed.