Difference of Type and Interface

[dzintars]

Hi all. Could someone explain me an difference of:

export type FeatureState = Readonly<{
  entities: { [id: string]: Entity }
  ids: string[]
}>

and

interface FeatureState {
  readonly entities: { [id: string]: Entity }
  readonly ids: string[]
}

?

phryneasToday at 10:48 AM
@dzintars There is none. Readonly is a mapped type that creates the second type
Well, minor differences. One is an interface and one is a type.
https://twitter.com/phry/status/1222241038884048896

Lenz Weber (@phry)
This #TypeScriptTuesday, we're going to take a look at #TypeScript's interfaces.
Interfaces are different from types and both have their strengths in different situations.
Let's take a look.
This is just some interface definition - again an example from the #redux types:
🧵👇

But in this situation that probably should not concern you, apart from the different "mouseover" behaviour

DzintarsToday at 11:00 AM
Thank you! Then.. what does the "industry" chooses in this context? Just interfaces?

phryneasToday at 11:02 AM
I've not seen any preference for one or the other really.

DzintarsToday at 11:35 AM
That tweet is really good. Thank you.

[dzintars]

https://youtu.be/hGdx0hpZsvs