You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: help.rs
    path of file: ./repos/operative-framework/opf-node/src
    
    the code of the file until where you have to start completion: use crate::Node;
use opf_models::error::ErrorKind;
use opf_models::event::{send_event_to, Domain, Event};
use opf_models::TargetType;
use strum::IntoEnumIterator;

unsafe impl Sync for Node {}
unsafe impl Send for Node {}

impl Node {
    pub async fn on_help(&self) -> Result<(), ErrorKind> {
        let headers = vec!["command".to_string(), "description".to_string()];
        let mut rows = vec![];

 
    
    pub async fn on_help(&self) -> Result<(), ErrorKind> {
        let headers = vec!["command".to_string(), "description".to_string()];
        let mut rows = vec![];

        for (name, description, usage) in opf_models::command::LISTS {
            let fields = vec![name.to_string(), description.to_string(), usage.to_string()];
            rows.push(fields);
        }
        let _ = send_event_to(
            &self.self_tx,
            (Domain::CLI, Event::ResponseTable((headers, rows))),
        )
        .await;

        // listing of target type
        let headers = vec!["target_type available".to_string()];
        let mut rows = vec![];
        for target_type in TargetType::iter() {
            let el = vec![target_type.to_string()];
            rows.push(el);
        }
        let _ = send_event_to(
            &self.self_tx,
            (Domain::CLI, Event::ResponseTable((headers, rows))),
        )
        .await;
        Ok(())
    }