What's the best way to attach functions to a TypeScript interface?

So I currently I have game objects with properties attached. For example, a creature card with properties attached. Now I have code like this:

const isSlow = card.properties.includes(Property.Slow);

const isSlow = card.properties.includes(Property.Slow);

I kinda hate this, especially if I have to write code like this all over the place.
Now ideally, I want to just put a predicate to the card so I implement it once and can just call

const isSlow = card.isSlow();

const isSlow = card.isSlow();

Is this possible with interfaces at all? Like an abstract prototype-ish implementation?

Some caveats:

I cannot use classes, cause that messes up my Redux state management and jsonifying states in general.

I also considered utility classes like

cardFunctions

cardFunctions

then I guess you could do

import { isSlow } from "./cardFunctions";
const isSlow = isSlow(card);

import { isSlow } from "./cardFunctions";
const isSlow = isSlow(card);

not the biggest fan but if that's the best there is I might go for it

Samathingamajig•10/9/22, 2:41 AM

is an enum?

Samathingamajig•10/9/22, 2:43 AM

wait if you're even considering utility classes why not just make the each function explicitly on the interface and on the class

Samathingamajig•10/9/22, 2:44 AM

(and if there's only one implementer of the class, you probably dont need the interface)

Samathingamajig•10/9/22, 2:44 AM

oh wait

Samathingamajig•10/9/22, 2:44 AM

I cannot use classes, cause that messes up my Redux state management and jsonifying states in general.

Samathingamajig•10/9/22, 2:45 AM

you can use the old fashioned prototype probably

Samathingamajig•10/9/22, 2:46 AM

and each time you create a card use

cyremurOP•10/9/22, 2:48 AM

Yeah property is an enum

cyremurOP•10/9/22, 2:50 AM

Can I just make a prototype for an interface? VS Code seems very confused by that. I don't understand what the extra

is doing

Samathingamajig•10/9/22, 2:51 AM

that's the constructor function

Samathingamajig•10/9/22, 2:51 AM

interfaces are completely erased a compile time

Samathingamajig•10/9/22, 2:51 AM

they aren't real

Samathingamajig•10/9/22, 2:51 AM

they're just for typesafety

Samathingamajig•10/9/22, 2:51 AM

you can't attach anything to the prototype of something that doesnt exist

cyremurOP•10/9/22, 2:52 AM

let me read up if I can do class shenanigans in Zustand...

cyremurOP•10/9/22, 2:52 AM

I'm getting kinda tired of Redux

Samathingamajig•10/9/22, 2:52 AM

redux is only for businesses in 2016

cyremurOP•10/9/22, 2:53 AM

I procrastinated this project a lot

Samathingamajig•10/9/22, 2:53 AM

do you even need a state management library, though?

cyremurOP•10/9/22, 2:54 AM

it has a board with 127 fields and creatures and cards in hand so... probably

cyremurOP•10/9/22, 2:54 AM

also Redux/liveblocks gives me multiplayer for free

cyremurOP•10/9/22, 2:55 AM

but yeah I went for RTK before I got into webdev youtube and now it feels like debt already