Attach a CSS or JS library to a View in Drupal 8

mymodule.libraries.yml

custom_view:
  css:
    component:
      css/custom_view.css: {}

mymodule.module

<?php 
/**
 * Implements hook_views_pre_render().
 */
function custom_views_pre_render(ViewExecutable $view) {
  if (isset($view) && ($view->storage->id() == 'my_view')) {
    $view->element['#attached']['library'][] = 'custom/custom_view';
  }
}