TypeScript · Senior · Question 63 of 75

What is `{ id: string } & { id: number }`?

✓Correct answer: An object type whose id is string & number, i.e. never, so no value can satisfy it
2{ id: string | number }
3A compile error at declaration

Explanation

Conflicting intersections don't fail immediately; errors appear later in confusing places. Prefer interface extends, which reports conflicts at once.

What is `{ id: string } & { id: number }`?

Explanation

Further reading

Problem with a question

Test yourself

What is { id: string } & { id: number }?

Explanation

Further reading

Test yourself

What is `{ id: string } & { id: number }`?