[react-infinite-scroller] add missing page param to loadMore method (#18428)

types/react-infinite-scroller/index.d.ts

@@ -1,6 +1,7 @@
 // Type definitions for react-infinite-scroller 1.0
 // Project: https://github.com/CassetteRocks/react-infinite-scroller
-// Definitions by: Lauri Lavanti <https://github.com/Lapanti>
+// Definitions by: Lauri Lavanti <https://github.com/Lapanti>,
+//                 Piotr Srebniak <https://github.com/psrebniak>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -33,8 +34,9 @@ declare namespace InfiniteScroll {
         isReverse?: boolean;
         /**
          * A callback for when more items are requested by the user.
+         * Page param is next page index.
          */
-        loadMore(): void;
+        loadMore(page: number): void;
         /**
          * The number of the first page to load, with the default of 0, the first page is 1.
          * Defaults to 0.

types/react-infinite-scroller/react-infinite-scroller-tests.tsx

@@ -5,7 +5,7 @@ class Test1 extends React.Component {
     render() {
         return (
             <InfiniteScroll
-                loadMore={() => {}}
+                loadMore={(page) => {}}
             >
                 <div>Test 1</div>
             </InfiniteScroll>
@@ -17,7 +17,7 @@ class Test2 extends React.Component {
     render() {
         return (
             <InfiniteScroll
-                loadMore={() => {}}
+                loadMore={(page) => {}}
                 element='section'
                 hasMore
                 initialLoad={false}