YNAB multicurrency sidebar converter (support for EUR, USD, GBP).

ynab-mulitcurrency-sidebar.js

// ==UserScript==
// @name         YNAB multicurrency sidebar converter
// @version      0.1
// @author       filip@appsilon.com
// @match        https://app.youneedabudget.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function multicurrency_sidebar() {
        var currencies = Array.from(document.querySelectorAll(".nav-account-row .nav-account-name")).map(x => x.innerText).map(x => x.match(/.* ([A-Z]{3})/m)[1])
        var rates = currencies.map(x => ({PLN: 1, USD: 3.8, EUR: 4.48, GBP: 4.93})[x]);
        var converted_balances = Array.from(document.querySelectorAll(".nav-account-row .nav-account-value .currency")).map(x => x.innerText).map(x => x.replace(/[, \sa-zł]/g, "").replace("−", "-")).map(Number).map((x,i) =>Math.round(x/rates[i]))
        Array.from(document.querySelectorAll(".nav-account-row .nav-account-value")).map((el, i) => {
            var currency = document.createElement("span");
            if (currencies[i] !== "PLN") {
                currency.innerHTML = (new Intl.NumberFormat('en-US', {
                    style: 'currency',
                    currency: currencies[i],
                    minimumFractionDigits: 2,
                    maximumFractionDigits: 2,
                })).format(converted_balances[i]/100) + " (~)";
                el.appendChild(currency);
            }
        })
        document.styleSheets[0].insertRule(".sidebar a { height: 3em;}", 0);
    }


    var checkExist = setInterval(function() {
        console.log('tick');
        if (document.querySelectorAll(".nav-account-row .nav-account-value").length) {
            multicurrency_sidebar();
            clearInterval(checkExist);
        }
    }, 500);

})();