diff --git a/.gitattributes b/.gitattributes
index 391f0a4..6313b56 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,2 +1 @@
-* text=auto
-*.js text eol=lf
+* text=auto eol=lf
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..6221132
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,21 @@
+/**
+Create an array without duplicates.
+
+@param array - The array to remove duplicates from.
+
+@example
+```
+import arrayUniq = require('array-uniq');
+
+arrayUniq([1, 1, 2, 3, 3]);
+//=> [1, 2, 3]
+
+arrayUniq(['foo', 'foo', 'bar', 'foo']);
+//=> ['foo', 'bar']
+```
+*/
+declare function arrayUniq<ValueType>(
+	array: ReadonlyArray<ValueType>
+): ValueType[];
+
+export = arrayUniq;
diff --git a/index.js b/index.js
index 3b29b27..82ea2b9 100644
--- a/index.js
+++ b/index.js
@@ -1,2 +1,5 @@
 'use strict';
-module.exports = x => [...new Set(x)];
+
+const arrayUniq = array => [...new Set(array)];
+
+module.exports = arrayUniq;
diff --git a/index.test-d.ts b/index.test-d.ts
new file mode 100644
index 0000000..8dc911b
--- /dev/null
+++ b/index.test-d.ts
@@ -0,0 +1,4 @@
+import {expectType} from 'tsd';
+import arrayUniq = require('.');
+
+expectType<number[]>(arrayUniq([1, 2, 3]));
diff --git a/package.json b/package.json
index bc6e2d0..4c85c36 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "array-uniq",
-	"version": "2.0.0",
+	"version": "2.1.0",
 	"description": "Create an array without duplicates",
 	"license": "MIT",
 	"repository": "sindresorhus/array-uniq",
@@ -13,10 +13,11 @@
 		"node": ">=6"
 	},
 	"scripts": {
-		"test": "xo && ava"
+		"test": "xo && ava && tsd"
 	},
 	"files": [
-		"index.js"
+		"index.js",
+		"index.d.ts"
 	],
 	"keywords": [
 		"array",
@@ -27,7 +28,8 @@
 		"remove"
 	],
 	"devDependencies": {
-		"ava": "*",
-		"xo": "*"
+		"ava": "^1.4.1",
+		"tsd": "^0.7.2",
+		"xo": "^0.24.0"
 	}
 }
diff --git a/test.js b/test.js
index 840baf8..309f637 100644
--- a/test.js
+++ b/test.js
@@ -1,7 +1,7 @@
 import test from 'ava';
-import m from '.';
+import arrayUniq from '.';
 
 test('main', t => {
-	t.deepEqual(m([1, 2, 2, 3, 1, 2, 4]), [1, 2, 3, 4]);
-	t.deepEqual(m(['a', 'a', 'b', 'a', 'c', 'a', 'd']), ['a', 'b', 'c', 'd']);
+	t.deepEqual(arrayUniq([1, 2, 2, 3, 1, 2, 4]), [1, 2, 3, 4]);
+	t.deepEqual(arrayUniq(['a', 'a', 'b', 'a', 'c', 'a', 'd']), ['a', 'b', 'c', 'd']);
 });