diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..53da9d6
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,48 @@
+export interface CognitoAuthOptions {
+  ClientId: string;
+  AppWebDomain: string;
+  RedirectUriSignIn: string;
+  RedirectUriSignOut: string;
+  TokenScopesArray?: string[];
+  IdentityProvider?: string;
+  userPoolId?: string;
+  AdvancedSecurityDataCollectionFlag?: boolean;
+}
+
+export class CognitoAuth {
+  constructor(options: CognitoAuthOptions);
+  getCognitoConstants(): any;
+  getClientId(): string;
+  getAppWebDomain(): string;
+  getCurrentUser(): any;
+  setUser(username: string): void;
+  useCodeGrantFlow(): void;
+  useImplicitFlow(): void;
+  getSignInUserSession(): any;
+  getUsername(): string;
+  setUsername(Username: string): void;
+  getSession(): void;
+  parseCognitoWebResponse(httpRequestResponse: string): void;
+  getCodeQueryParameter(httpRequestResponse: string): void;
+  getTokenQueryParameter(httpRequestResponse: string): void;
+  getCachedSession(): any;
+  getLastUser(): string;
+  cacheTokenScopes(): void;
+  compareSets(set1: any, set2: any): boolean;
+  getHostName(url: string): string;
+  getQueryParameters(url: string, splitMark: string): any;
+  generateRandomString(length: number, chars: string): string;
+  clearCachedTokensScopes(): void;
+  refreshSession(refreshToken: any): void;
+  makePOSTRequest(header: any, body: any, url: string, onSuccess: any, onFailure: any): void;
+  createCORSRequest(method: string, url: string): any;
+  onFailure(err: any): any;
+  onSuccessRefreshToken(jsonData: any): void;
+  onSuccessExchangeForToken(jsonData: any): void;
+  launchUri(URL: string): void;
+  getSpaceSeperatedScopeString(): string;
+  getFQDNSignIn(): string;
+  signOut(): void;
+  getFQDNSignOut(): string;
+  getUserContextData(): any;
+}
diff --git a/package.json b/package.json
index 01d8c4c..466fd8d 100755
--- a/package.json
+++ b/package.json
@@ -45,6 +45,7 @@
   "main": "lib/index.js",
   "module": "es/index.js",
   "jsnext:main": "es/index.js",
+  "types": "./index.d.ts",
   "dependencies": {
     "buffer": "4.9.1"
   },