JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo" data-foo="1" data-bar="2" data-baz="3" ></div>

JavaScript

Element.prototype.dataset_simulated = function(){
    var attributes = this.attributes;
    var simulatedDataset = {};

    for (var i = attributes.length; i--; ){
        if (/^data-.*/.test(attributes[i].name)) {
            var key = attributes[i].name.replace('data-', '');
            var value = div.getAttribute(attributes[i].name);
            simulatedDataset[key] = value;
        }
    }
    return simulatedDataset;
};

var div = document.getElementsByTagName("div")[0];

window.console.log('dataset_simulated: ', div.dataset_simulated());
window.console.log('dataset: ', div.dataset);