DependentFormField mixin, where is it?

[funder7]

Hello,
I was reading this paragraph in the doc: https://nova.laravel.com/docs/v4/customization/fields#dependent-form-field

I couldn't find the DependentFormField mixing anywhere in the laravel-nova package. Is it abandoned or..?

[funder7]

Sorry, the IDE wasn't pointing me to the file by ctrl clicking, so I assumed it was missing.

Here's the path in case others are looking for it: vendor/laravel/nova/resources/js/mixins/DependentFormField.js