Why is js breaking with requirejs in templates on Magento 2 and how to fix?

Finally this is a solutions that works for me.

https://themeforest.net/item/porto-ultimate-responsive-magento-theme/9725864/comments?page=293#comment_16606311

"Kroellie

Finally figured out the solution for javascript messages:

Uncaught TypeError: $(...).swMegamenu is not a function
Uncaught TypeError: $(...).stellar is not a function
Uncaught TypeError: $(...).owlCarousel is not a function
Uncaught TypeError: $.widget is not a function

If you suffer the same, do this:

create a requirejs-config.js in the root of the child theme

app/design/frontend/Smartwave/porto_child and put in the following:

 var config = {
    shim: {
        jquery: {
            exports: '$'
        },
        'Smartwave_Megamenu/js/sw_megamenu':
            {
                deps: ['jquery']
            }, 
        'owl.carousel/owl.carousel.min':
            {
                deps: ['jquery']
            },
        'js/jquery.stellar.min': 
            {
            deps: ['jquery']
            },
        'js/jquery.parallax.min':
            {
            deps: ['jquery']
            }
    }
};

And change the entries:

    <script src="jquery.js" />
    <script src="bootstrap/js/bootstrap.min.js" />
    <script src="fancybox/js/jquery.fancybox.js" />

To:

    <remove src="jquery.js" />
    <remove src="bootstrap/js/bootstrap.min.js" />
    <remove src="fancybox/js/jquery.fancybox.js" />

Within file:

app/design/frontend/Smartwave/porto_child/Magento_Theme/layout/default_head_blocks.xml

Tada! No more need for merging javascripts, no more javascript errors! I have no need for the fancybox, turned it off, but if you do require it, I guess it should be included in the requirejs as well. "