:sig
u64 ws_broadcast(String message, String scope = "")

:params
message : text message to send
scope : optional scope identifier, defaults to the current WebSocket page scope
return value : number of clients the message was queued for

:desc
Queues a text WebSocket message for every client connected to the given scope and returns the number of recipients.

If `scope` is omitted, the current page scope is used.

This helper currently sends text frames only.

:see
>websocket