Type Alias EventCallback 

pub type EventCallback = Arc<dyn Fn(ThreadEvent) -> Option<ThreadEvent> + Send + Sync>;

Optional callback invoked for each event received from the CLI.

• Return Some(event) to pass the event through (possibly transformed).
• Return None to filter the event out of the stream.

When no callback is configured, all events pass through unchanged.

Aliased Type

pub struct EventCallback { /* private fields */ }