World(Vector2 size, GameMode gamemode)

Constructor of a world with a given size and gamemode

Source 

World(Vector2 this.size, GameMode this.gamemode)
{
    onActorSpawned = _actorSpawnedEvent.stream.asBroadcastStream();
    onActorRemoved = _actorRemovedEvent.stream.asBroadcastStream();
}