Get image style programmatically for Drupal 8

blissgo.php

<?php

  use Drupal\image\Entity\ImageStyle;

  function blissgo_preprocess_node(&$variables) {
   $node = $variables['node'];

   if(!empty($node->field_image[0])) {
     $path = $node->field_image->entity->getFileUri();
     $url = ImageStyle::load('teaser_image')->buildUrl($path);
     $variables['teaser_image_url'] = $url;
   }

  }