get nice data from a slack archive

parseSlackArchive.js

'use strict';

const fs = require('fs');
const path = require('path');
const async = require('async');

const getUserFromMessage = (messageObject, userList) => {
  const relevantUser = userList.filter(user => {
    return (user.id == messageObject.user);
  })[0];
  
  return {
    name: relevantUser.name,
    img: relevantUser.profile.image_512
  };
}

module.exports = (folderPath, callback) => {
  const users = require(folderPath + '/users.json');
  const channels = require(folderPath + '/channels.json');
  const channelNames = channels.map(channel => {
    return `${folderPath}/${channel.name}`;
  });
  
  const totalChannelContents = [];

  const traverseChannel = (channelPath, next) => {
    let channelContents = [];
    fs.readdir(channelPath, (err, files) => {
      if (err) {
        throw(err);
      }
      files.map(file => {
        return path.join(channelPath, file);
      }).filter(file => {
        return fs.statSync(file).isFile()
      }).forEach(file => {
        const contents = require(`./${file}`);
        contents.forEach(message => {
          totalChannelContents.push(message);
        });
      });
      next();
    });
  };

  async.each(channelNames, traverseChannel, err => {
    callback({
      totalChannelContents,
      getUserFromMessage,
      users
    });
  });
};