TypeScript TV

TS2531

Object is possibly 'null'.

Broken Code ❌

type Person = {
  address: {
    street: string;
    zipCode: number;
  } | null;
  name: string;
};
 
function logStreet(person: Person): void {
  console.log(person.address.street);
}

Fixed Code ✔️

The error originates from the fact that address can be null. To fix the problem, we can check if address is null by using optional chaining:

type Person = {
  address: {
    street: string;
    zipCode: number;
  } | null;
  name: string;
};
 
function logStreet(person: Person): void {
  console.log(person.address?.street);
}