Download custom emojis from slack

main.js

const fs = require('fs')
const fetch = require('node-fetch')

;(async () => {
  const data = JSON.parse(fs.readFileSync('./data.json', 'utf-8'))

  // const html = fs.readFileSync('./x.html', 'utf-8')
  // const customTag = '<h3 class="p-emoji_picker__heading">Custom</h3>'
  // const text = html.includes(customTag) ? html.slice(html.indexOf(customTag)) : html
  // const re = /<span class="emoji emoji-sizer" style="background-image:url\((.*?)\)" data-codepoints="(.*?)">/g

  // for (;;) {
  //   const match = re.exec(text)
  //   if (!match) break

  //   data[match[2]] = match[1]
  // }
  // fs.writeFileSync('./data.json', JSON.stringify(data, null, 2), 'utf-8')

  try {
    fs.mkdirSync('./emojis')
  } catch (err) {
    if (err.code !== 'EEXIST') throw err
  }

  for (const [key, value] of Object.entries(data)) {
    console.log(key, value)

    const resp = await fetch(value)
    const body = await resp.arrayBuffer()
    const ext = value.match(/\.(\w+)$/)[1]
    fs.writeFileSync(`./emojis/${key}.${ext}`, Buffer.from(body))
  }
})()