diff --git a/gettext.js/gettext.js-tests.ts b/gettext.js/gettext.js-tests.ts
new file mode 100644
index 0000000000..6e5b4448ae
--- /dev/null
+++ b/gettext.js/gettext.js-tests.ts
@@ -0,0 +1,21 @@
+import * as Gettext from 'gettext.js';
+
+const json: Gettext.JsonData = {
+  "": {
+    "locale": "fr",
+    "plural-forms": "nplurals=2; plural=n>1;"
+  },
+  "Welcome": "Bienvenue",
+  "There is %1 apple": [
+    "Il y a %1 pomme",
+    "Il y a %1 pommes"
+  ]
+};
+
+const instance: Gettext.Gettext = Gettext.i18n();
+
+instance.loadJSON(json, 'messages');
+instance.setLocale('fr');
+if (instance.ngettext('There is %1 apple', 'There are %1 apples', 0) === 'Il y a %1 pomme') {
+  throw new Error('Failed test');
+}
diff --git a/gettext.js/index.d.ts b/gettext.js/index.d.ts
new file mode 100644
index 0000000000..5096490721
--- /dev/null
+++ b/gettext.js/index.d.ts
@@ -0,0 +1,45 @@
+// Type definitions for gettext.js 0.5
+// Project: https://github.com/guillaumepotier/gettext.js
+// Definitions by: Julien Crouzet <https://github.com/jucrouzet>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export type PluralForm = (n: number) => number;
+
+export type GettextStatic = (options?: GettextOptions) => Gettext;
+
+export interface GettextOptions {
+  domain?: string;
+  locale?: string;
+  plural_func?: PluralForm;
+  ctxt_delimiter?: string;
+}
+
+export interface JsonDataHeader {
+  locale: string;
+  "plural-forms": string;
+}
+
+export interface JsonDataMessages {
+  [key: string]: string | string[] | JsonDataHeader;
+}
+
+export interface JsonData extends JsonDataMessages {
+  "": JsonDataHeader;
+}
+
+export interface Gettext {
+  setMessages: (domain: string, locale: string, messages: JsonDataMessages, plural_forms?: PluralForm) => Gettext;
+  loadJSON: (jsonData: JsonData, domain?: string) => Gettext;
+  setLocale: (locale: string) => Gettext;
+  getLocale: () => string;
+  textdomain: (domain?: string) => Gettext | string;
+  gettext: (msgid: string, ...args: any[]) => string;
+  ngettext: (msgid: string, msgid_plural: string, n: number, ...args: any[]) => string;
+  pgettext: (msgctxt: string, msgid: string, ...args: any[]) => string;
+  dcnpgettext: (domain: string, msgctxt: string, msgid: string, msgid_plural: string, n: number, ...args: any[]) => string;
+  __: (msgid: string, ...args: any[]) => string;
+  _n: (msgid: string, msgid_plural: string, n: number, ...args: any[]) => string;
+  _p: (msgctxt: string, msgid: string, ...args: any[]) => string;
+}
+
+export const i18n: GettextStatic;
diff --git a/gettext.js/tsconfig.json b/gettext.js/tsconfig.json
new file mode 100644
index 0000000000..d01ec061ab
--- /dev/null
+++ b/gettext.js/tsconfig.json
@@ -0,0 +1,22 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "gettext.js-tests.ts"
+    ]
+}
diff --git a/gettext.js/tslint.json b/gettext.js/tslint.json
new file mode 100644
index 0000000000..2221e40e4a
--- /dev/null
+++ b/gettext.js/tslint.json
@@ -0,0 +1 @@
+{ "extends": "../tslint.json" }
\ No newline at end of file