class RouteTest {
  data: Data;

  constructor(data: Data) {
    this.data = data;
  }
}

type Data = {
  [name: string]: any;
};

class UserTest {
  role: string;

  constructor(role: string) {
    this.role = role;
  }
}

const routeTest = new RouteTest({ roles: ['role1', 'role2'] });
const userTest = new UserTest('role2');

/* 1) Should succeed */
if (userTest && routeTest.data && routeTest.data.roles && routeTest.data.roles.includes(userTest.role))
{
  console.log('Success 1a');
}
else {
  console.log('Failure 1a');
}
if (userTest && routeTest?.data?.roles?.includes(userTest.role))
{
  console.log('Success 1b (using optional chaining)');
}
else {
  console.log('Failure 1b (using optional chaining)');
}

userTest.role = 'role3';
/* 2) User role is not in the routeTest.roles, should fail*/
if (userTest && routeTest.data && routeTest.data.roles && routeTest.data.roles.includes(userTest.role))
{
  console.log('Success 2a');
}
else {
  console.log('Failure 2a');
}
if (userTest && routeTest?.data?.roles?.includes(userTest.role))
{
  console.log('Success 2b (using optional chaining)');
}
else {
  console.log('Failure 2b (using optional chaining)');
}

/* RouteTest.data.roles does not exist, should fail */
routeTest.data = {notRoles: ['notRole1', 'notRole2']};
if (userTest && routeTest.data && routeTest.data.roles && routeTest.data.roles.includes(userTest.role))
{
  console.log('Success 3a');
}
else {
  console.log('Failure 3a');
}
if (userTest && routeTest?.data?.roles?.includes(userTest.role))
{
  console.log('Success 3b (using optional chaining)');
}
else {
  console.log('Failure 3b (using optional chaining)');
}