when to use type vs interface typescript
/**
* Modern Typescript types and interfaces are both very powerful (2020)
* It is almost down to personal choice, these days.
* Key differences:
- The type alias can also be used for other types such as primitives,
unions, and tuples.
- Unlike a type alias, an interface can be defined multiple times,
and will be treated as a single interface
* Decision on when to use:
- Personally, I use the interface to make it clear that it
is intended to be implemented and types for everything else.
*/
// type
type Person = {
name: string;
age: number;
}
type speak = (sentence: string) => void;
// interface
interface Person extends Human {
name: string;
age: number;
}
interface speak {
(sentence: string): void;
}