Creating Role-Based RPC Authentication Middleware in TypeScript

export class Session extends Context.Tag("Session")<
  Session,
  { userId: UserId; role: UserRole }
>() {}

export class AuthMiddleware extends RpcMiddleware.Tag<AuthMiddleware>()(
  "AuthMiddleware",
  {
    provides: Session,
    failure: UnauthorizedError,
    requiredForClient: true,
  }
) {}