JS code that connects to Slack as a bot and answers 'ping' with 'pong'.

slackbot.js

const { RTMClient, WebClient } = require('@slack/client');

var CLIENT_EVENTS = require('@slack/client').CLIENT_EVENTS;

const token = 'xoxb-token-here';

async function runBot() {
  const rtm = new RTMClient(token);
  const web = new WebClient(token);
 
  const r = await rtm.start();
  console.log("Connected", r);
  
  const lookupResponse = await web.users.lookupByEmail({email: 'steve@example.com'});
  const user = lookupResponse.user;
  console.log("Got user", user);
 
  const groups = await web.groups.list();
  console.log("Found Groups", groups);
 
  const devGroup = groups.groups.find((g)=>(g.name === 'dev'));

  async function handleMessage(message) {
    console.log("on.message", message);
    if (message.text === 'ping') {
      rtm.sendMessage('pong', devGroup.id);
    }
  }
 
  rtm.on('message', (message)=>{
    handleMessage(message);
  });
}