Extracting / Exporting custom emoji from Slack

00_README

This builds off the excellent work of @lmarkus.

The scripts below can be used in conjunction with the Neutral Face Emoji Tools Google Chrome extension to (bulk!) 
export emojis from one Slack team and import into another team: 
https://chrome.google.com/webstore/detail/neutral-face-emoji-tools/anchoacphlfbdomdlomnbbfhcmcdmjej

Original work here: https://gist.github.com/lmarkus/8722f56baf8c47045621

Steps:
1) Run js in dev tools
2) Save json object in a txt file
3) Run bash script
4) Drag and drop all of the downloaded emojis in the bulk uploader 
  enabled through the chrome extension 

downloadSlackEmojis.sh

#!/usr/bin/env bash
# Use: 
# Make this file executable, and feed it the results from the Slack emoji URL dump. Files will be downloaded to `output`
# 	chmod +x downloadSlackEmojis.sh
# 	./downloadSlackEmojis.sh emojiURLs.txt
#
# Note: This depends on the jq utility for parsing json from the command line - https://stedolan.github.io/jq/

mkdir -p output;

jq -r '.[] | "curl -s -o \"output/\(.name)\(.extension)\" \"\(.url)\""' $1 | \
while read -r line; do eval "$line"; done

# You can now drag and drop all the emoji files in the output folder to the Bulk Emoji Uploader space that you'll see on
# the https://<team>.slack.com/customize/emoji page if you've installed the chrome extension
# https://chrome.google.com/webstore/detail/neutral-face-emoji-tools/anchoacphlfbdomdlomnbbfhcmcdmjej

extractSlackEmojiUrls.js

// Login to your team through the browser. 
// Go to: https://<team name>.slack.com/customize/emoji
// Run this on the browser's dev tools javascript console

// This code scrolls to bottom of page to load all emojis
// (bc of virtualized list not revelaing all of the elements).
// Slow connections may wish to adjust the above factor past 2.5
var scrollTime = $(document).height() * 2.5
$("html, body").animate({ scrollTop: $(document).height() }, scrollTime);

var emojis = $('.emoji_row');
var numEmojis = emojis.size();

var pre = document.createElement('pre');
pre.append('[\n');

// After waiting for the scroll, grab url/name for each emoji
// and populate a json object that will appear at the bottom of the page
window.setTimeout(function() {
    emojis.each(function(index) {
        var url = $(this).find('td:nth-child(1) span').attr('data-original');
        var extension = url.substring(url.lastIndexOf('.'));
        var name = $(this).find('td:nth-child(2)').html().replace(/:|\s/g, '');
        pre.append(JSON.stringify({ name: name, extension: extension, url: url }));
        if (index == (numEmojis - 1)) {
            pre.append('\n]');
        } else {
            pre.append(',\n');
        }
    });
    console.log(pre);
}, scrollTime + 1000);

// Now, at the bottom of the page you'll see the json representation of all the emoji data
// copy and paste the json into a file (named "emojiURLs.txt" in "downloadSlackEmojis.sh" instructions) 
// and use with downloadSlackEmojis.sh

@JPablomr your script works wonders, but for some reason, in Chrome, the virtual list stops loading after about 4 loads (manual or with your script)

FireFox will continue to load the virtual list indefinitely, but I get this error in the console:

SyntaxError: await is only valid in async functions and async generators debugger eval code:43:2

I tried to replace await sleep(SLEEP_TIME); in your script w/ the following: (async () => {await sleep(SLEEP_TIME);})(); but that doesn't seem to be doing the trick. Any thoughts on how to make the script FireFox dev console friendly?

UPDATE for 2019:
Hi folks... Author of the original gist here.
There's a much easier way to get the emoji list. I've updated the original gist, and added a Readme with the new approach.
( https://gist.github.com/lmarkus/8722f56baf8c47045621 )

Thanks to all the folks that have contributed to enhancing this solution over the years. ❤️ OpenSource!

Enjoy your emoji, and give me a follow on twitter @lennymarkus