RobustToolbox/Robust.Server/Player/FilterSystem.cs

using Robust.Shared.GameObjects;
using Robust.Shared.Player;

namespace Robust.Server.Player;

internal sealed class FilterSystem : SharedFilterSystem
{
    public override Filter FromEntities(Filter filter, params EntityUid[] entities)
    {
        foreach (var uid in entities)
        {
            if (TryComp(uid, out ActorComponent? actor))
                filter.AddPlayer(actor.PlayerSession);
        }

        return filter;
    }
}