Function pick

packages/effect/src/internal/context.ts:312–324

(...tags: Tags)

/** @internal */
export const pick =
  <Tags extends ReadonlyArray<C.Tag<any, any>>>(...tags: Tags) =>
  <Services>(self: C.Context<Services>): C.Context<
    Services & C.Tag.Identifier<Tags[number]>
  > => {
    const tagSet = new Set<string>(tags.map((_) => _.key))
    const newEnv = new Map()
    for (const [tag, s] of self.unsafeMap.entries()) {
      if (tagSet.has(tag)) {
        newEnv.set(tag, s)
      }
    }
    return makeContext(newEnv)
  }

/** @internal */
export const omit =