Drupal 8 - Hook form alter views exposed form

d8-views-exp-form-alter.php

<?php

/**
 * Implements hook_form_alter().
 */
function MYMODULE_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
  $view_names = array('my_view_name');
  $view = $form_state->getStorage('view');
  if ($form_id == 'views_exposed_form' && in_array($view['view']->id(), $view_names)) {
    // Do some shilzzle.
  }
}