is this empty: T[]: []; line need for performance?

[well1791]

I ask about the use of emptyUsers: User[] = [] from https://redux.js.org/tutorials/essentials/part-8-rtk-query-advanced#selecting-users-data

For context, my team believes that the docs suggest the practice (of the emptyEntity: Entity[] = [] as part of a performance bit to avoid re-rendering (or any other improvements on performance). I (on the other hand) am convinced that it's just a semantic way to say "this empty array represents an empty list of users" plus it helps documentation (no performance effect in the middle), which to me also means, I could remove that variable and send the empty array directly (instead of creating/casting a value for it).

I know, it may sound silly but I would like some some input on this.

[EskiMojo14]

your selectors should return a stable reference, because a new reference is treated as a change in state. if your selector returned a new array instance every time it was called, you would get unnecessary rerenders.

[well1791]

that's great to know! thank you so much for your explanation! really appreciated