diff --git a/index.tests.ts b/index.tests.ts
index 947a0d0..f9d7821 100644
--- a/index.tests.ts
+++ b/index.tests.ts
@@ -22,7 +22,7 @@ describe('Cookie Store', () => {
       const result = await window.cookieStore.get(foo);
       expect(result).to.deep.equal({ name: foo, value: bar });
     });
-    
+
     it('returns undefined when no cookie is found', async () => {
       const foo = 'foo';
       const bar = 'bar';
@@ -52,7 +52,7 @@ describe('Cookie Store', () => {
       const result = await window.cookieStore.getAll(bar);
       expect(result).to.deep.equal([{ name: bar, value: baz }]);
     });
-    
+
     it('returns an empty when no matching cookies are found', async () => {
       const foo = 'foo';
       const bar = 'bar';
diff --git a/package.json b/package.json
index 481e72b..2ec54b5 100644
--- a/package.json
+++ b/package.json
@@ -53,8 +53,9 @@
     "node": ">= 10.16"
   },
   "scripts": {
-    "test": "npm run test:ts && eslint '**/*.ts'",
+    "test": "npm run test:ts && eslint '**/*.ts' && npm run prettier",
     "test:ts": "karma start karma.conf.js  --single-run",
+    "prettier": "prettier --check '**/*'",
     "preversion": "npm test",
     "banner": "banner-cli index.js",
     "build": "tsc",