How to properly make a property of a class type?

class TokenManager {}
const params = type({
  tokenManager: type(['instanceof', TokenManager]),
})

class TokenManager {}
const params = type({
  tokenManager: type(['instanceof', TokenManager]),
})

    tokenManager: {
        refreshToken: Promise<TokenInfo>;
        readonly isTokenValid: boolean;
        readonly token: string | undefined;
    };

    tokenManager: {
        refreshToken: Promise<TokenInfo>;
        readonly isTokenValid: boolean;
        readonly token: string | undefined;
    };