What is the difference between ‘type’ and ‘interface’ when extending other types?

Question

TypeScript Professional — Medium

What is the difference between ‘type’ and ‘interface’ when extending other types?

Accepted Answer

When extending other types, interfaces use 'extends' and support declaration merging, while type aliases use '&' for composition and cannot be merged. This distinction is important to understand how to properly extend and combine types in TypeScript.