Drupal 8 views alter

cmi_test.install.php

<?php

/**
 * @file
 * Install file to handle module install and uninstall.
 */

/**
 * Implements hook_install().
 * Add an exposed filter for comment approval.
 */
function cmi_test_install() {
  // Check to make sure views is enabled.
  if (\Drupal::moduleHandler()->moduleExists('views')) {
    // Get the view.
    $view = \Drupal::entityTypeManager()->getStorage('view')->load('comments_recent');

    // Add the filter.
    $display =& $view->getDisplay('page');
    $display['display_options']['filters']['status'] =  [
      'id' => 'status',
      'table' => 'comment_field_data',
      'field' => 'status',
      'relationship' => 'none',
      'group_type' => 'group',
      'admin_label' => '',
      'operator' => '=',
      'value' => TRUE,
      'group' => 1,
      'exposed' => TRUE,
      'expose' => [
        'operator_id' => '',
        'label' => 'Approved comment',
        'description' => '',
        'use_operator' => FALSE,
        'operator' => 'status_op',
        'identifier' => 'status',
        'required' => TRUE,
        'remember' => FALSE,
        'multiple' => FALSE,
        'remember_roles' => [
          'authenticated' => 'authenticated',
          'anonymous' => 0,
          'administrator' => 0,
        ],
      ],
      'is_grouped' => FALSE,
      'group_info' => [
        'label' => '',
        'description' => '',
        'identifier' => '',
        'optional' => TRUE,
        'widget' => 'select',
        'multiple' => FALSE,
        'remember' => FALSE,
        'default_group' => 'All',
        'default_group_multiple' => [],
        'group_items' => [],
      ],
      'plugin_id' => 'boolean',
      'entity_type' => 'comment',
      'entity_field' => 'status',
    ];

    // Save.
    $view->save();
  }
}

/**
 * Implements hook_uninstall().
 * Remove an exposed filter for comment approval.
 */
function cmi_test_uninstall() {
  // Check to make sure views is enabled.
  if (\Drupal::moduleHandler()->moduleExists('views')) {
    // Get the view.
    $view = \Drupal::entityTypeManager()->getStorage('view')->load('comments_recent');

    // Remove the filter.
    $display = &$view->getDisplay('page');
    unset($display['display_options']['filters']['status']);

    // Save.
    $view->save();
  }
}