JSFiddle - React, Tailwind, and code Playground

JavaScript

(function(){
    var setup = function IOBreadcrumb() {
        this.breadcrumbs = [];
        this.add = function(title, url) {
            console.log('adding');
            var crumb = {
                title: title, 
                url:url
              };
            this.breadcrumbs.push(crumb);
        }
    };
  
 
  window.IOBreadcrumb = new setup();
})(window);

console.log('before add')
IOBreadcrumb.add()