JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo">asd</div>

JavaScript

;(function ( $, window, document, undefined ) {
    
    var pluginName = 'test';
    var defaults;
    
    function Plugin(element, options) {
        this.element = element;

        this.options = $.extend( {}, defaults, options) ;
       
        this._name = pluginName;
        
        this.init();
    }

    Plugin.prototype = {
        init: function() {
            this.hello();
        },
        hello : function() {
            document.write('hello');
        },
        goodbye : function() {
            document.write('goodbye');
        }
    }
    

    $.fn[pluginName] = function ( options ) {
            return this.each(function () {
                if (!$.data(this, 'plugin_' + pluginName)) {
                    $.data(this, 'plugin_' + pluginName, 
                    new Plugin( this, options ));
                }
            });
    }
            
    
})( jQuery, window, document );

$(document).ready(function() {
    var test = $("#foo").test().data("plugin_test");
    test.goodbye();
});