AviKav

let downloaded = new Set();
let observer = new MutationObserver(arr => {
    for (let mutationRecord of arr) {
        for (let node of Array.from(mutationRecord.addedNodes)) {
            let canvas = node.parentElement.getElementsByTagName("canvas")[0];
            if (canvas && !downloaded.has(canvas.id)) {
                downloaded.add(canvas.id);
                saveCanvasAsPNG(canvas);
            }
        }

AviKav

function recursiveAssign(target, ...sources) {
    for (let i of let objs = Object.keys(sources)) {
        let obj = sources[objs[i]];
        if ((typeof obj !== "object" || obj === null) && obj === sources[sources.length-1]) {
            // If `sources[objs[i]]` is a a non `Object` built-in and the is (or is the same as) last element in `sources`, then there is no need to go any further. Also, `typeof null  === "object"`
            if (obj === sources[sources.length-1]) {
                target = obj;
                return;
            }
        } else {