fancyload-8.x-1.8/fancyload.install

<?php

/**
 * Implements hook_requirements()
 */
function fancyload_requirements() {
  $requirements = [];

  if (!file_exists('libraries/responsive-lazy-loader/js/jquery.responsivelazyloader.js') || !file_exists('libraries/responsive-lazy-loader/js/jquery.responsivelazyloader.min.js')) {
    $requirements = [
      'fancyload.library' => [
        'title' => t('Fancyload'),
        'value' => t('Responsive lazy loader library missing'),
        'description' => t("The Responsive lazy loader library could not be found. Download the library <a target=\"_blank\" href=\"https://github.com/jetmartin/responsive-lazy-loader\">here</a>. Place the folder inside the libraries folder so that jquery.responsivelazyloader.js and jquery.responsivelazyloader.min.js are found in libraries/responsive-lazy-loader/js. Visit the Fancyload project page or read the README.md file for more instructions."),
        'severity' => REQUIREMENT_WARNING,
      ],
    ];
  }

  return $requirements;
}