--- /dev/null
+<?php
+
+namespace Drupal\slick;
+
+/**
+ * Provides an interface defining Slick skins.
+ *
+ * The hook_hook_info() is deprecated, and no resolution by 1/16/16:
+ * #2233261: Deprecate hook_hook_info()
+ * Postponed till D9
+ *
+ * @see slick.api.php for more supported methods.
+ */
+interface SlickSkinInterface {
+
+ /**
+ * Returns the Slick skins.
+ *
+ * This can be used to register skins for the Slick. Skins will be
+ * available when configuring the Optionset, Field formatter, or Views style,
+ * or custom coded slicks.
+ *
+ * Slick skins get a unique CSS class to use for styling, e.g.:
+ * If your skin name is "my_module_slick_carousel_rounded", the CSS class is:
+ * slick--skin--my-module-slick-carousel-rounded
+ *
+ * A skin can specify CSS and JS files to include when Slick is displayed,
+ * except for a thumbnail skin which accepts CSS only.
+ *
+ * Each skin supports 5 keys:
+ * - name: The human readable name of the skin.
+ * - description: The description about the skin, for help and manage pages.
+ * - css: An array of CSS files to attach.
+ * - js: An array of JS files to attach, e.g.: image zoomer, reflection, etc.
+ * - group: A string grouping the current skin: main, thumbnail.
+ * - provider: A module name registering the skins.
+ *
+ * @return array
+ * The array of the main and thumbnail skins.
+ */
+ public function skins();
+
+}