How to Merge Layers with Conditional Logic in TypeScript

const NewFooLive = Layer.effect(
  Foo,
  Effect.gen(function* () {
    const fooA = yield* Foo
    const fooB = yield* Foo
    return {
      foo: Effect.gen(function* () { if (someCondition) fooA.foo() else fooB.foo() })
    }
  })
)

const NewFooLive = Layer.effect(
  Foo,
  Effect.gen(function* () {
    const fooA = yield* Foo
    const fooB = yield* Foo
    return {
      foo: Effect.gen(function* () { if (someCondition) fooA.foo() else fooB.foo() })
    }
  })
)