Function getUserPosts1

test/README.example.proof.ts:962–967

(userId: number)

    const fetchPosts = effect("fetchPosts")<[userId: number], any[]>;

    const getUserPosts1 = (userId: number) =>
      effected(function* () {
        const user = yield* fetchUser(userId);
        if (!user) return null;
        return yield* fetchPosts(user.id);
      });

    expect(getUserPosts1).to(
      equal<