Add TypeScript declaration file

Author: dgraham

index.d.ts

@@ -0,0 +1,4 @@
+export function on<K extends keyof GlobalEventHandlersEventMap>(name: K, selector: string, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: EventListenerOptions): void;
+export function on(name: string, selector: string, listener: EventListener, options?: EventListenerOptions): void;
+export function off(name: string, selector: string, listener: EventListener, options?: EventListenerOptions): void;
+export function fire(target: EventTarget, name: string, detail?: any): boolean;

package.json

@@ -6,6 +6,7 @@
   "repository": "dgraham/delegated-events",
   "main": "dist/index.umd.js",
   "module": "dist/index.esm.js",
+  "types": "index.d.ts",
   "scripts": {
     "clean": "rm -rf build dist",
     "flow": "flow check",
@@ -44,6 +45,7 @@
     "rollup-plugin-node-resolve": "^5.1.0"
   },
   "files": [
-    "dist"
+    "dist",
+    "index.d.ts"
   ]
 }