diff --git a/.editorconfig b/.editorconfig
index e98f58d..ea8f4ab 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -1,18 +1,17 @@
-# EditorConfig: http://EditorConfig.org
+# EditorConfig is awesome: https://EditorConfig.org
 
-# top-most EditorConfig file
 root = true
 
-# Unix-style newlines with a newline ending every file
 [*]
-charset = utf-8
 end_of_line = lf
-trim_trailing_whitespace = true
 insert_final_newline = true
+
+[*.{js,d.ts,ts}]
+charset = utf-8
+trim_trailing_whitespace = true
 indent_style = space
 indent_size = 4
 
-# 2 space indentation
-[*.yaml, *.yml]
+[package.json,*.yaml]
 indent_style = space
 indent_size = 2
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..94f480d
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+* text=auto eol=lf
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7d84008..0ba02f2 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+<a name="2.1.0"></a>
+# [2.1.0](https://github.com/faker-javascript/boolean) (2022-01-11)
+* Added xo, tsd, c8.
+* Improved tests.
+
 <a name="2.0.1"></a>
 # [2.0.1](https://github.com/faker-javascript/boolean) (2022-01-10)
 * GitHub docs updates.
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..6513ead
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1 @@
+export default function boolean(): boolean;
diff --git a/index.js b/index.js
index d5cdcba..83cc819 100644
--- a/index.js
+++ b/index.js
@@ -1,3 +1,3 @@
 export default function boolean() {
     return Math.random() >= 0.5;
-};
\ No newline at end of file
+}
diff --git a/index.test-d.ts b/index.test-d.ts
new file mode 100644
index 0000000..a018568
--- /dev/null
+++ b/index.test-d.ts
@@ -0,0 +1,4 @@
+import {expectType} from 'tsd';
+import boolean from './index.js';
+
+expectType<boolean>(boolean());
diff --git a/package.json b/package.json
index 53c92e3..d212023 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@fakerjs/boolean",
-  "version": "2.0.1",
+  "version": "2.1.0",
   "description": "Boolean package provides functionality to generate a fake boolean value.",
   "license": "MIT",
   "repository": "faker-javascript/boolean",
@@ -15,14 +15,17 @@
     "node": ">=12"
   },
   "scripts": {
-    "test": "c8 ava"
+    "test": "c8 ava; xo --space 4; tsd;"
   },
   "devDependencies": {
-    "ava": "^3.15.0",
-    "c8": "^7.11.0"
+    "ava": "^4.0.0",
+    "c8": "^7.11.0",
+		"tsd": "^0.19.1",
+		"xo": "^0.47.0"
   },
   "files": [
-    "index.js"
+    "index.js",
+    "index.d.ts"
   ],
   "keywords": [
     "fakerjs",
diff --git a/test.js b/test.js
index e23874f..261c261 100644
--- a/test.js
+++ b/test.js
@@ -1,6 +1,6 @@
-import boolean from './index.js';
 import test from 'ava';
+import boolean from './index.js';
 
 test('boolean return type to be boolean', t => {
-	t.is(typeof boolean(), 'boolean');
-});
\ No newline at end of file
+    t.is(typeof boolean(), 'boolean');
+});