How to listen to variations events

Hello,

I need to style the variations <select> differently, so I’m using this plugin: https://select2.github.io/

I need to instantiate select2 after Woocommerce is done updating the <select> with the available <option>s, otherwise the styled <select> will have all options.

Which event should I listen on? I pretty much tried everything that gets fired in ‘add-to-cart-variation.js’, like this:

jQuery('.bundle_form').on('woocommerce_variation_select_change', function() {
 //code to instantiate select2
});

The above code only works when I first change a select, whereas I need it to execute on page load (right after woocommerce is done).

Thank you