diff --git a/express-brute/express-brute.d.ts b/express-brute/express-brute.d.ts
index 7242d44dc..1e672fdfb 100644
--- a/express-brute/express-brute.d.ts
+++ b/express-brute/express-brute.d.ts
@@ -45,85 +45,101 @@ declare module "express-brute" {
     }
 
     /**
-     * @summary Middleware.
+     * @summary Options for {@link ExpressBrute} class.
+     * @interface
+     */
+    interface ExpressBruteOptions {
+        freeRetries: number;
+        proxyDepth: number;
+        attachResetToRequest: boolean;
+        refreshTimeoutOnRequest: boolean;
+        minWait: number;
+        maxWait: number;
+        lifetime: number;
+        failCallback: (req: express.Request, res: express.Response, next: Function, nextValidRequestDate: any) => void;
+        handleStoreError: any;
+}
+
+/**
+ * @summary Middleware.
+ * @class
+ */
+class ExpressBrute {
+    /**
+     * @summary Constructor.
+     * @constructor
+     * @param {any} store The store.
+     */
+    constructor(store: any);
+
+    /**
+     * @summary Generates middleware that will bounce requests with the same key and IP address that happen faster than the current wait time by calling failCallback.
+     * @param {Object} options The options.
+     */
+    getMiddleware(options: ExpressBruteMiddleware): express.RequestHandler;
+
+    /**
+     * @summary Uses the current proxy trust settings to get the current IP from a request object.
+     * @param {Request} request The HTTP request.
+     * @return {RequestHandler} The Request handler.
+     */
+    getIPFromRequest(request: express.Request): express.RequestHandler;
+
+    /**
+     * @summary Middleware that will bounce requests that happen faster than the current wait time by calling failCallback.
+     * @param {Request}     request     The HTTP request.
+     * @param {Response}    response    The HTTP response.
+     * @param {Function}    next        The next middleware.
+     * @return {RequestHandler} The Request handler.
+     */
+    prevent(request: express.Request, response: express.Response, next: Function): express.RequestHandler;
+
+    /**
+     * @summary Resets the wait time between requests back to its initial value.
+     * @param {string}      ip      The IP address.
+     * @param {string}      key     The key. response.
+     * @param {Function}    next    The next middleware.
+     * @return {RequestHandler} The Request handler.
+     */
+    reset(ip: string, key: string, next: Function): express.RequestHandler;
+}
+
+module ExpressBrute {
+    /**
+     * @summary In-memory store.
      * @class
      */
-    class ExpressBrute {
+    export class MemoryStore {
         /**
          * @summary Constructor.
          * @constructor
-         * @param {any} store The store.
-         */
-        constructor(store: any);
-
-        /**
-         * @summary Generates middleware that will bounce requests with the same key and IP address that happen faster than the current wait time by calling failCallback.
          * @param {Object} options The options.
          */
-        getMiddleware(options: ExpressBruteMiddleware): express.RequestHandler;
+        constructor(options?: MemoryStoreOptions);
+        /**
+         * @summary Gets key value.
+         * @param {string}      key     The key name.
+         * @param {Function}    callbck The callback.
+         */
+        get(key: string, callback: (error: any, data: Object) => void): void;
 
         /**
-         * @summary Uses the current proxy trust settings to get the current IP from a request object.
-         * @param {Request} request The HTTP request.
-         * @return {RequestHandler} The Request handler.
+         * @summary Sets the key value.
+         * @param {string}      key      The name.
+         * @param {string}      value    The value.
+         * @param {number}      lifetime The lifetime.
+         * @param {Function}    callback The callback.
          */
-        getIPFromRequest(request: express.Request): express.RequestHandler;
+        set(key: string, value: any, lifetime: number, callback: (error: any) => void): void;
 
         /**
-         * @summary Middleware that will bounce requests that happen faster than the current wait time by calling failCallback.
-         * @param {Request}     request     The HTTP request.
-         * @param {Response}    response    The HTTP response.
-         * @param {Function}    next        The next middleware.
-         * @return {RequestHandler} The Request handler.
+         * @summary Deletes the key.
+         * @param {string}      key      The name.
+         * @param {Function}    callback The callback.
          */
-        prevent(request: express.Request, response: express.Response, next: Function): express.RequestHandler;
-
-        /**
-         * @summary Resets the wait time between requests back to its initial value.
-         * @param {string}      ip      The IP address.
-         * @param {string}      key     The key. response.
-         * @param {Function}    next    The next middleware.
-         * @return {RequestHandler} The Request handler.
-         */
-        reset(ip: string, key: string, next: Function): express.RequestHandler;
+        reset(key: string, callback: (error: any) => void): void;
     }
+}
 
-    module ExpressBrute {
-        /**
-         * @summary In-memory store.
-         * @class
-         */
-        export class MemoryStore {
-            /**
-             * @summary Constructor.
-             * @constructor
-             * @param {Object} options The options.
-             */
-            constructor(options?: MemoryStoreOptions);
-            /**
-             * @summary Gets key value.
-             * @param {string}      key     The key name.
-             * @param {Function}    callbck The callback.
-             */
-            get(key: string, callback: (error: any, data: Object) => void): void;
-
-            /**
-             * @summary Sets the key value.
-             * @param {string}      key      The name.
-             * @param {string}      value    The value.
-             * @param {number}      lifetime The lifetime.
-             * @param {Function}    callback The callback.
-             */
-            set(key: string, value: any, lifetime: number, callback: (error: any) => void): void;
-
-            /**
-             * @summary Deletes the key.
-             * @param {string}      key      The name.
-             * @param {Function}    callback The callback.
-             */
-            reset(key: string, callback: (error: any) => void): void;
-        }
-    }
-
-    export = ExpressBrute;
+export = ExpressBrute;
 }
diff --git a/i18next-sprintf-postprocessor/i18next-sprintf-postProcessor-tests.ts b/i18next-sprintf-postprocessor/i18next-sprintf-postProcessor-tests.ts
new file mode 100644
index 000000000..a28aec01f
--- /dev/null
+++ b/i18next-sprintf-postprocessor/i18next-sprintf-postProcessor-tests.ts
@@ -0,0 +1,10 @@
+///<reference path="i18next-sprintf-postProcessor.d.ts"/>
+
+import * as i18next from "i18next";
+import sprintf from "i18next-sprintf-postprocessor";
+
+function initTest() {
+    const i18nextOptions = {};
+    i18next.use(sprintf).init(i18nextOptions);
+    i18next.init({ overloadTranslationOptionHandler: sprintf.overloadTranslationOptionHandler });
+}
diff --git a/i18next-sprintf-postprocessor/i18next-sprintf-postProcessor.d.ts b/i18next-sprintf-postprocessor/i18next-sprintf-postProcessor.d.ts
new file mode 100644
index 000000000..838cd0311
--- /dev/null
+++ b/i18next-sprintf-postprocessor/i18next-sprintf-postProcessor.d.ts
@@ -0,0 +1,17 @@
+// Type definitions for i18next-sprintf-postProcessor
+// Project: https://github.com/i18next/i18next-sprintf-postProcessor
+// Definitions by: Cyril Schumacher <https://github.com/cyrilschumacher>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+///<reference path="../express/express.d.ts"/>
+///<reference path="../i18next/i18next.d.ts"/>
+
+declare module "i18next-sprintf-postprocessor" {
+    import i18next = require("i18next");
+
+    export default interface i18nextSprintfPostProcessor {
+        process(value: any, key: string, options: Object): void;
+        overloadTranslationOptionHandler(args: Array<any>): void;
+    }
+    //export default function sprintf(): any;
+}
diff --git a/i18next/i18next.d.ts b/i18next/i18next.d.ts
index 9256e7a45..4a20978ff 100644
--- a/i18next/i18next.d.ts
+++ b/i18next/i18next.d.ts
@@ -8,6 +8,7 @@
 /// <reference path="../express/express.d.ts" />
 /// <reference path="../jquery/jquery.d.ts" />
 /// <reference path="../i18next-express-middleware/i18next-express-middleware.d.ts" />
+/// <reference path="../i18next-sprintf-postprocessor/i18next-sprintf-postprocessor.d.ts" />
 
 interface IResourceStore {
     [language: string]: IResourceStoreLanguage;
@@ -29,7 +30,11 @@ interface I18nTranslateOptions extends I18nextOptions {
     context?: any;
 }
 
-interface I18nextOptions {
+interface i18nextSprintfPostProcessorStatic {
+    overloadTranslationOptionHandler: any;
+}
+
+interface I18nextOptions extends i18nextSprintfPostProcessorStatic {
     lng?: string;                           // Default value: undefined
     load?: string;                          // Default value: 'all'
     preload?: string[];                     // Default value: []
@@ -77,6 +82,8 @@ interface I18nextOptions {
 
     // NOTE https://github.com/borisyankov/DefinitelyTyped/pull/5590
     replace?: any;
+
+    overloadTranslationOptionHandler: (args: Array<any>) => void;
 }
 
 interface I18nextStatic {