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/.gitignore b/.gitignore
index e7ef1ee..bac2cd5 100755
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 # Global
 node_modules/
+coverage
 
 # OS Generated
 .DS_Store*
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 82e2738..f5eef4d 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/integer) (2022-01-12)
+* Added xo, tsd, c8.
+* Improved tests.
+
 <a name="2.0.1"></a>
 # [2.0.1](https://github.com/faker-javascript/integer) (2022-01-10)
 * GitHub docs updates.
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..954c217
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,5 @@
+interface Options {
+    min?: number;
+    max?: number;
+}
+export default function integer(options?: Options): number;
diff --git a/index.js b/index.js
index 3540d89..3a6ef06 100644
--- a/index.js
+++ b/index.js
@@ -3,12 +3,14 @@ export default function integer(options) {
     let max = options.max === undefined ? Number.MAX_SAFE_INTEGER : options.max;
     let min = options.min === undefined ? Number.MIN_SAFE_INTEGER : options.min;
     if (typeof min !== 'number' || typeof max !== 'number') {
-		throw new TypeError('Expected all arguments to be numbers.');
-	}
+        throw new TypeError('Expected all arguments to be numbers.');
+    }
+
     if (min > max) {
-		throw new TypeError('Min cannot be greater than Max.');
-	}
+        throw new TypeError('Min cannot be greater than Max.');
+    }
+
     min = Math.ceil(min);
     max = Math.floor(max);
     return Math.floor(Math.random() * (max - min + 1)) + min;
-};
\ No newline at end of file
+}
diff --git a/index.test-d.ts b/index.test-d.ts
new file mode 100644
index 0000000..f880a1e
--- /dev/null
+++ b/index.test-d.ts
@@ -0,0 +1,6 @@
+import {expectType} from 'tsd';
+import integer from './index.js';
+
+expectType<number>(integer());
+expectType<number>(integer({min: 0}));
+expectType<number>(integer({min: 0, max: 10}));
diff --git a/package.json b/package.json
index 0eb3757..71489b1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@fakerjs/integer",
-  "version": "2.0.1",
+  "version": "2.1.0",
   "description": "Integer package provides functionality to generate a fake integer value.",
   "license": "MIT",
   "repository": "faker-javascript/integer",
@@ -15,13 +15,17 @@
     "node": ">=12"
   },
   "scripts": {
-    "test": "ava"
+    "test": "c8 ava; xo --space 4; tsd;"
   },
   "devDependencies": {
-    "ava": "^3.15.0"
+    "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 3a2fb7f..809edd1 100644
--- a/test.js
+++ b/test.js
@@ -1,34 +1,26 @@
-import integer from './index.js';
 import test from 'ava';
+import integer from './index.js';
 
 test('integer return type to be number', t => {
-	t.is(typeof integer(), 'number');
+    t.is(typeof integer(), 'number');
 });
 
 test('integer with number min 0 return type to be number', t => {
-	t.is(typeof integer({min: 0}), 'number');
+    t.is(typeof integer({min: 0}), 'number');
 });
 
 test('integer with number min 0 and max 10 return type to be number', t => {
-	t.is(typeof integer({min: 0, max: 10}), 'number');
+    t.is(typeof integer({min: 0, max: 10}), 'number');
 });
 
 test('integer with number min 0 and max 10 less than 11', t => {
-	t.true(integer({min: 0, max: 10}) < 11);
+    t.true(integer({min: 0, max: 10}) < 11);
 });
 
-test('integer with string to thow error on string', t => {
-  const error = t.throws(() => {
-		integer({min: 'string'})
-	}, {instanceOf: TypeError});
+test('integer with string to thow error on min > max', t => {
+    const error = t.throws(() => {
+        integer({min: 10, max: 0});
+    }, {instanceOf: TypeError});
 
-	t.is(error.message, 'Expected all arguments to be numbers.');
+    t.is(error.message, 'Min cannot be greater than Max.');
 });
-
-test('integer with string to thow error on min > max', t => {
-	const error = t.throws(() => {
-		  integer({min: 10, max: 0})
-	  }, {instanceOf: TypeError});
-  
-	  t.is(error.message, 'Min cannot be greater than Max.');
-  });
\ No newline at end of file