TS2790

error TS2790: The operand of a ‘delete’ operator must be optional.

Broken Code ❌

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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:

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interface User {
  age?: number;
  name: string;
}

const benny: User = {
  age: 35,
  name: 'Benny'
};

delete benny.age;