TS2790

The operand of a 'delete' operator must be optional.

Broken Code ❌

interface User {
  age: number;
  name: string;
}
 
const benny: User = {
  age: 35,
  name: 'Benny',
};
 
delete benny.age;

Fixed Code ✔️

When using the delete operator to remove a property from an object, the property must be defined as optional in TypeScript:

interface User {
  age?: number;
  name: string;
}
 
const benny: User = {
  age: 35,
  name: 'Benny',
};
 
delete benny.age;