mariusgnicula

Include your JS into a normal file, just how you are used to and enqueue it with wp_enqueue_script. This will not work in the editor, because you want the functions to fire when you add them.
At the beginning of your widget file, add ‘use Elementor\Plugin;’.
Then at the end of the render() function in your PHP, add this:

<?php if ( Plugin::$instance->editor->is_edit_mode() ) : ?>

  <script>Your code here</script

<?php