🎃 A user-script to auto-choose "Auto-merge Squash" in the PR unless it's a release PR

github_butternut_squash.js

// ==UserScript==
// @name         Butternut Squash
// @namespace    http://tampermonkey.net/
// @version      0.3
// @description  Choose Auto-merge Squash unless it's a release PR
// @author       Serge Bedzhyk
// @icon         https://www.google.com/s2/favicons?sz=64&domain=github.io
// @match        https://github.com/*
// ==/UserScript==

if (navigator.userAgent.indexOf('Safari') > -1) { HTMLElement.prototype.checkVisibility = function() { return this.getBoundingClientRect().x > 0 } }

function wfe(selector){return new Promise(resolve=>{if(document.querySelector(selector)){return resolve(document.querySelector(selector))};const observer=new MutationObserver(mutations=>{if(document.querySelector(selector)){resolve(document.querySelector(selector));observer.disconnect()}});observer.observe(document.body,{childList:true,subtree:true})})}
function last(arr) {return arr[arr.length - 1]}

async function main() {
    const releaseBranches = ['production', 'qa']
    const targetBranch = "span.css-truncate-target"
    const menuArrows = "summary[aria-label='Select merge method']"
    const squashOption = "button[value='squash']"
    const menuList = "details-menu.js-merge-method-menu"

    if(!window.location.pathname.includes('/pull/')) return

    await wfe(targetBranch)
    if (releaseBranches.includes(document.querySelector(targetBranch).textContent)) return

    await wfe(menuArrows)
    last(document.querySelectorAll(menuArrows)).click()

    await wfe(squashOption)
    document.querySelector(squashOption).click()

    let visible = false
    document.querySelectorAll(menuList).forEach((e) => { visible = (visible || e.checkVisibility()) })

    if (visible) {
        last(document.querySelectorAll(menuArrows)).click()
        document.querySelector(squashOption).click()
    }

    console.log(">>>> Butternut Squaaaaash!!! 🎃")
    window.scrollTo(0, 0)
}

(async function() {
    let lastUrl = location.href

    new MutationObserver(() => {
        const url = location.href
        if (url !== lastUrl) {
            lastUrl = url
            onUrlChange()
        }
    }).observe(document, {subtree: true, childList: true})


    async function onUrlChange() {
        await main()
    }

    await main()
})()