Quick script to extract all messages in a Slack channel and group by total reactions

extract_perf_wins_slack.js

const { WebClient } = require('@slack/web-api');

async function asyncForEach(array, callback) {
  for (let index = 0; index < array.length; index++) {
    await callback(array[index], index, array);
  }
}

// An access token (from your Slack app or custom integration - xoxp, xoxb)
const token = process.env.SLACK_TOKEN;

if(! token) {
  console.log("missing $SLACK_TOKEN env var api token");
  return;
}

const web = new WebClient(token);
const conversationId = 'CG4C97BC0'; // #performance-wins channel
const messages = [];
let message_count = 0;

(async () => {
  let finished = false;
  let next_cursor = "";
  while(! finished) {
    let res = await web.conversations.history({ channel: conversationId, cursor: next_cursor });
    res.messages.forEach(msg => {  
      if(msg.subtype && (msg.subtype == "channel_leave" || msg.subtype == "channel_join"))
        return;   
      message_count++;      
      let reactions = msg.reactions ? 
        msg.reactions.reduce(
          (acc, current) => acc + current.count, 0
        ) : 
        0;
      if(reactions > 0) {
        messages.push(
          {
            reaction_count: reactions,
            short_message: msg.text.substring(0, 80).replace(/(\r\n|\n|\r|,|\t)/gm, ""),
            message: msg.text.replace(/(\r\n|\n|\r|,|\t)/gm, ""),
            user: msg.user
          }
        )
      }
    });
    finished = ! res.has_more;
    next_cursor = res.response_metadata.next_cursor;
  }  

  asyncForEach(messages, async (msg) => {
    let userInfo = await web.users.info({ user: msg.user }); 
    console.log(msg.reaction_count + ", " + userInfo.user.name + ", " + userInfo.user.real_name + ", " + msg.message);
  });

})();