diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..de01662
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,62 @@
+/// <reference types="node" />
+declare module "@digipolis/authz" {
+	export type Source = "authzv2" | "meauthz" | "meauthzv2" | "externalAuthz";
+	export interface BaseConfig {
+		debug?: boolean;
+		disabled?: boolean;
+		cache?: boolean;
+		tokenLocation?: string;
+		source: Source;
+		sources: {
+			externalAuthz?: Function;
+			url?: string;
+			apiKey?: string;
+			applicationId?: string;
+		};
+	}
+
+	export interface Config extends BaseConfig {
+		debug: boolean;
+		set: boolean;
+		disabled: boolean;
+		tokenLocation: string;
+		cache: boolean;
+	}
+
+	function checkOneOfPermissions(
+		authToken: string,
+		requiredPermissions?: string | string[],
+		requestedsource?: Source
+	): void;
+	function checkPermission(
+		authToken: string,
+		requiredPermissions?: string | string[],
+		requestedsource?: Source
+	): void;
+	function config(config: BaseConfig, force?: boolean): Config;
+	function getConfig(): Config;
+	function getPermissions(authToken: string, datasource: Source): string[];
+	function hasOneOfPermissions(
+		requiredPermissions: string | string[],
+		source: Source
+	): Promise<void>;
+	function hasPermission(
+		requiredPermissions: string | string[],
+		source: Source
+	): Promise<void>;
+	function hasPermissions(
+		requiredPermissions: string | string[],
+		source: Source
+	): Promise<void>;
+
+	export = {
+		checkOneOfPermissions,
+		checkPermission,
+		config,
+		getConfig,
+		getPermissions,
+		hasOneOfPermissions,
+		hasPermission,
+		hasPermissions,
+	};
+}
diff --git a/package.json b/package.json
index f6aea50..2aae3ed 100644
--- a/package.json
+++ b/package.json
@@ -2,6 +2,7 @@
   "name": "@digipolis/authz",
   "version": "1.4.1",
   "description": "Authorization module which can be used to check the permissions of an authenticated user.",
+  "types": "index.d.ts",
   "scripts": {
     "test": "mocha ./test && npm run lint",
     "lint": "eslint \"**/*.js\"",