Can I Access Javascript Events?

How to find these settings...

1. Online Store
2. Click ••• (Theme Customizer)
3. Edit code
4. Open Assets > script.custom.js

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Add custom Javascript to various events without having to edit the original files.

Variant Change

document.addEventListener('_changeVariant', function(event) {
  //console.log('Variant change')
});

Cart Update

document.addEventListener('cartItems', function(event) {
  //console.log('Cart has been updated')
});