leaderboard.js

import { blue, green } from 'chalk'
import { Client } from 'discord.js'

const client = new Client()

client.login(process.env.DISCORD_TOKEN).then(async () => {
  const guild = client.guilds.get('394954745612399274')
  
  await guild.fetchMembers()

  const allResults = await Promise.all(
    guild.members
      .array()
      .map(author =>
        guild
          .search({ author })
          .then(({ totalResults }) => [author, totalResults])
      )
  )

  allResults.sort(([, c1], [, c2]) => c2 - c1)

  const totalMessageCount = allResults.reduce((acc, [, c]) => acc + c, 0)

  console.log(`Total message count: ${totalMessageCount}`)

  const pad = i => i.toString().padStart(3, '0')

  allResults
    .map(([author, messageCount]) => [
      author.displayName,
      `@${author.user.username}#${author.user.discriminator}`,
      messageCount,
      (messageCount / totalMessageCount * 100).toFixed(3)
    ])
    .forEach(([displayName, mention, messageCount, ratio], i) =>
      console.log(
        `#${pad(i + 1)} - ${displayName} <${mention}>: ${messageCount} (${ratio}%)`
      )
    )
})