Add TypeScript definitions

Thanks to soerenbf for initial version

package.json

@@ -4,8 +4,10 @@
   "description": "Scroll position manager for React applications",
   "main": "lib/index.js",
   "files": [
-    "lib"
+    "lib",
+    "src/index.d.ts"
   ],
+  "types": "src/index.d.ts",
   "scripts": {
     "build": "babel src --out-dir lib",
     "lint": "eslint 'src/*.js' 'test/*.js'",

src/index.d.ts

@@ -0,0 +1,18 @@
+import React from 'react';
+import { History } from 'history';
+
+export interface ScrollManagerProps {
+  history: History;
+  sessionKey?: string;
+  timeout?: number;
+}
+
+export class ScrollManager extends React.Component<ScrollManagerProps> { }
+
+export class WindowScroller extends React.Component { }
+
+export interface ElementScrollerProps {
+  scrollKey: string;
+}
+
+export class ElementScroller extends React.Component<ElementScrollerProps> { }