Drupal 8, how to connect custom form and JS on one page?

Question

Drupal

First, I needed to connect my form in my plugin.
Implemented:
registered in routing

_form: '\Drupal\my plugin\Form\my form'

After that, it was required to connect JS on this page
. But, as I understand it, in routing you need to write either

_form:

or

_controller:

How to eat a fish and not sit down?)

Answer 1

You need to declare your js file in *.libraries.yml file of your module and then add JS to the form
For more details, see the documentation
https://www.drupal.org/docs/8/creating-custom-modu...