diff --git a/i18next/i18next-tests.ts b/i18next/i18next-tests.ts
index 2b4ce5a45..f40d10b3a 100644
--- a/i18next/i18next-tests.ts
+++ b/i18next/i18next-tests.ts
@@ -112,7 +112,7 @@ describe('i18next', function () {
 
                 describe('to current', function () {
 
-                    var spy;
+                    var spy: any;
 
                     beforeEach(function (done) {
                         spy = sinon.spy(i18n.sync, '_fetchOne');
@@ -140,7 +140,7 @@ describe('i18next', function () {
 
                 describe('to unspecific', function () {
 
-                    var spy;
+                    var spy: any;
 
                     beforeEach(function (done) {
                         spy = sinon.spy(i18n.sync, '_fetchOne');
@@ -174,7 +174,7 @@ describe('i18next', function () {
 
             describe('with fallback language set to false', function () {
 
-                var spy;
+                var spy: any;
 
                 beforeEach(function (done) {
                     spy = sinon.spy(i18n.sync, '_fetchOne');
@@ -202,7 +202,7 @@ describe('i18next', function () {
 
             describe('preloading multiple languages', function () {
 
-                var spy;
+                var spy: any;
 
                 beforeEach(function (done) {
                     spy = sinon.spy(i18n.sync, '_fetchOne');
@@ -325,7 +325,7 @@ describe('i18next', function () {
 
                     describe('with using localStorage', function () {
 
-                        var spy;
+                        var spy: any;
 
                         before(function () {
                             window.localStorage.removeItem('res_en-US');
@@ -378,7 +378,7 @@ describe('i18next', function () {
 
             describe('using function provided in callback\'s argument', function () {
 
-                var cbT;
+                var cbT: any;
 
                 beforeEach(function (done) {
                     i18n.init(opts, function (t) { cbT = t; done(); });
@@ -394,7 +394,7 @@ describe('i18next', function () {
 
             describe('using localStorage', function () {
 
-                var spy;
+                var spy: any;
 
                 before(function () {
                     window.localStorage.removeItem('res_en-US');
@@ -462,7 +462,7 @@ describe('i18next', function () {
                             resStore: {
                                 'en-US': { translation: { 'simple_en-US': 'ok_from_en-US' } }
                             }
-                        }, function (t) { done(); }));
+                        }, function (t: any) { done(); }));
                     });
 
                     it('it should translate the uppercased lng value', function () {
@@ -484,7 +484,7 @@ describe('i18next', function () {
                             resStore: {
                                 'en-us': { translation: { 'simple_en-us': 'ok_from_en-us' } }
                             }
-                        }, function (t) { done(); }));
+                        }, function (t: any) { done(); }));
                     });
 
                     it('it should translate the lowercase lng value', function () {
@@ -529,7 +529,7 @@ describe('i18next', function () {
 
         describe('preloading multiple languages', function () {
 
-            var spy;
+            var spy: any;
 
             beforeEach(function (done) {
                 spy = sinon.spy(i18n.sync, '_fetchOne');
@@ -599,7 +599,7 @@ describe('i18next', function () {
         describe('post missing resources', function () {
 
             describe('to fallback', function () {
-                var server, stub;
+                var server: any, stub: any;
 
                 beforeEach(function (done) {
                     server = sinon.fakeServer.create();
@@ -631,7 +631,7 @@ describe('i18next', function () {
             });
 
             describe('to all', function () {
-                var server, stub;
+                var server: any, stub: any;
 
                 beforeEach(function (done) {
                     server = sinon.fakeServer.create();
@@ -1165,7 +1165,7 @@ describe('i18next', function () {
                 };
 
                 beforeEach(function (done) {
-                    i18n.init($.extend(opts, { resStore: resStore })).done(function (t) { done(); });
+                    i18n.init($.extend(opts, { resStore: resStore })).done(function (t: any) { done(); });
                 });
 
                 it('it should provide passed in resources for translation', function () {
diff --git a/i18next/i18next-tests.ts.tscparams b/i18next/i18next-tests.ts.tscparams
deleted file mode 100644
index e16c76dff..000000000
--- a/i18next/i18next-tests.ts.tscparams
+++ /dev/null
@@ -1 +0,0 @@
-""
diff --git a/i18next/i18next.d.ts b/i18next/i18next.d.ts
index 7b29d19c7..5fd631030 100644
--- a/i18next/i18next.d.ts
+++ b/i18next/i18next.d.ts
@@ -79,7 +79,7 @@ interface I18nextStatic {
             remove: (name: string) => void;
         };
         detectLanguage(): string;
-        log(message: string);
+        log(message: string): void;
         toLanguages(language: string): string[];
         regexEscape(str: string): string;
     };
@@ -93,7 +93,7 @@ interface I18nextStatic {
             name: string;
             numbers: number[];
             plurals: (n: number) => number;
-        });
+        }): void;
         get (language: string, count: number): number;
         rules: any;
         setCurrentLng: (language: string) => void;
diff --git a/i18next/i18next.d.ts.tscparams b/i18next/i18next.d.ts.tscparams
deleted file mode 100644
index e16c76dff..000000000
--- a/i18next/i18next.d.ts.tscparams
+++ /dev/null
@@ -1 +0,0 @@
-""