Record Types

1. Create a UsersById type using Record that maps string IDs to User
2. Create a RoleCounts type using Record that maps role strings to numbers
3. Type the provided usersById and roleCounts objects with those aliases (remove the @ts-expect-error comments once the types exist)
4. Export usersById and roleCounts by name

Completion criteria

• Named exports: usersById, roleCounts
• usersById.u1.name is 'Ava' and usersById.u2.role is 'member'
• roleCounts deep-equals { admin: 1, member: 1 }