Question about io.to(arr)

[SupertigerDev]

When I use the code below, it only emits to the users that are joined to the 2 rooms.

io.to(["room1", "room2"]).emit(...)

However, when the array is empty, it is emitting to everyone. I don't know if this is a bug or what but I dont want it to emit to anyone if the array is empty.

io.to([]).emit(...)

[darrachequesne]

Hi! There is indeed currently no distinction between emitting empty array (io.to([]).emit(...)) and no array (io.emit(...)):

• socket.io/lib/broadcast-operator.ts

  Line 17 in 5ab8289

  private readonly rooms: Set<Room> = new Set<Room>(),

• https://github.com/socketio/socket.io-adapter/blob/b92d65cf9c6124930fac78349e2a0b847fe19f16/lib/index.ts#L290

We could add one though. What do you think?

[SupertigerDev]

Hello! Yes that would be amazing ❤️