customize shopify code example
Example 1: how to add jquery to shopify
<head>
<script
src="https://code.jquery.com/jquery-3.4.1.js"
integrity="sha256-WpOohJOqMqqyKL9FccASB9O0KwACQJpFTUBLTYOVvVU="
crossorigin="anonymous">
</script>
</head>
Example 2: can we update app code in shopify
You need to contact the individual app|service, as using them with your store
doesn't grant you access to their code or ability to the source of generated
assets for your store. That is something they have to build as a feature.
Example 3: custom js shopify
If I understand correctly, the asset_url filter is what you are looking for.
To include a JS file in a .liquid file, you use:
{{ 'script.js' | asset_url | script_tag }}
And a CSS file:
{{ 'style.css' | asset_url | stylesheet_tag }}