JQuery Lazy Load - Adjustment in type appear (#24799)

* Adjustment in type appear

* Allow type null in appear

* Adjustments

types/jquery-lazyload/index.d.ts

@@ -15,7 +15,7 @@ declare namespace JQueryLazyLoad {
         container?: JQuery;
         data_attribute?: string;
         skip_invisible?: boolean;
-        appear?: null;
+        appear?: ((elementsLeft: number, options: Options) => void) | null;
         load?: (elementsLeft?: number, options?: Options) => void;
         placeholder?: string;
     }

types/jquery-lazyload/jquery-lazyload-tests.ts

@@ -9,7 +9,10 @@ $(document).ready(() => {
         effect: 'fadeIn',
         container: $('#container'),
         failure_limit: 10,
-        skip_invisible: true
+        skip_invisible: true,
+        appear: (elementsLeft: number, settings: JQueryLazyLoad.Options) => {
+            console.log(elementsLeft);
+        }
     };
     $('.lazyload').lazyload(options);