Slack message emoji spammer

spam.js

(async () => {
    const toggleEmojiList = () => document.querySelector('#add-reaction').click()
    const getEmojiNodes = () => document.querySelectorAll('[id^=emoji]:not(.hidden)[aria-label*=emoji]')
    const sleep = (ms) => new Promise((resolve, reject) => setTimeout(resolve, ms))
    
    let emojiN = 0
    let emojiLength = null

    if (!emojiLength) {
        toggleEmojiList()
        emojiLength = getEmojiNodes().length
        console.log(emojiLength)
        toggleEmojiList()
    }

    if (!emojiLength) {
        console.error("Can't find emojiLength")
        return
    }
    
    for (let i = emojiN; i < emojiLength; i++) {
        toggleEmojiList()
        await sleep(500)
        getEmojiNodes()[i].click()
        emojiN++
    } 
})();

usage.md

Select Add reaction button for target message

Add add-reaction html id attr for button

Copy and paste spam.js code in console and hit enter.