Added type definitions to make it Typescript compatible

package.json

@@ -18,11 +18,12 @@
     "url": "https://github.com/node-facebook/facebook-node-sdk.git"
   },
   "main": "./lib/fb.js",
+  "types": "./lib/fb.d.ts",
   "scripts": {
     "precommit": "lint-staged",
     "lint": "eslint .",
-    "build": "babel src/ -d lib/",
-    "buildw": "babel -w src/ -d lib/",
+    "build": "babel src/ -d lib/ --copy-files",
+    "buildw": "babel -w src/ -d lib/ --copy-files",
     "test": "npm run build && node ./node_modules/mocha/bin/mocha --recursive",
     "test-live": "npm run build && node ./node_modules/mocha/bin/mocha --require test_live/_supports/ci-safe --recursive test_live",
     "prepublish": "npm run build"

src/fb.d.ts

@@ -0,0 +1,82 @@
+interface FBOptions {
+    accessToken: string;
+    appId: string;
+    appSecret: string;
+    version?: string;
+    proxy?: string;
+    timeout?: number;
+    scope?: string;
+    redirectUri?: string;
+    Promise?: Promise<any>;
+}
+
+interface SignedRequestResponse {
+    oauthToken: string;
+    userId: string;
+    userCountry: string;
+}
+
+interface UsageInterface {
+    callCount: number;
+    totalTime: number;
+    totalCPUTime: number;
+}
+
+interface FBError {
+    name: string;
+    message: string;
+    response: number;
+}
+
+interface FBResponseObject {
+    data: any;
+    error: any;
+}
+
+export class Facebook {
+    constructor(options?: FBOptions);
+
+    api(path: string): Promise<any>;
+
+    api(path: string, method: string): Promise<any>;
+
+    api(path: string, params: any): Promise<any>;
+
+    api(path: string, method: string, params: any): Promise<any>;
+
+    extend(options: FBOptions): Facebook;
+
+    getAccessToken(): string;
+
+    getAppUsage(): UsageInterface;
+
+    getPageUsage(): UsageInterface;
+
+    getLoginUrl(options: FBOptions): string;
+
+    napi(path: string): void;
+
+    napi(path: string, method: string): void;
+
+    napi(path: string, params: any): void;
+
+    napi(path: string, method: string, params: any): void;
+
+    options(): FBOptions;
+
+    options(key: string): string;
+
+    options(options: FBOptions): void;
+
+    parseSignedRequest(signedRequest: string, appSecret: string): SignedRequestResponse;
+
+    setAccessToken(accessToken: string): void;
+
+    withAccessToken(accessToken: string): Facebook;
+}
+
+export const version: string;
+
+export function FacebookApiException(res: FBResponseObject): FBError;
+
+export const FB: Facebook;