diff --git a/package.json b/package.json
index 9345685..c5e868d 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,8 @@
     "start": "rollup -c -w",
     "prepare": "yarn run build",
     "predeploy": "cd example && yarn install && yarn run build",
-    "deploy": "gh-pages -d example/build"
+    "deploy": "gh-pages -d example/build",
+    "format": "prettier --write \"{src,example/src}/**/*.{js,ts}*\""
   },
   "dependencies": {
     "redux": "^4.0.5"
@@ -38,6 +39,7 @@
     "babel-runtime": "^6.26.0",
     "cross-env": "^5.1.4",
     "gh-pages": "^1.2.0",
+    "prettier": "^1.19.1",
     "prop-types": "^15.7.2",
     "react": "^16.12.0",
     "react-dom": "^16.12.0",
diff --git a/yarn.lock b/yarn.lock
index 585f7c5..7c64126 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7668,7 +7668,7 @@ preserve@^0.2.0:
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
   integrity sha1-gV7R9uvGWSb4ZbMQwHE7yzMVzks=
 
-prettier@^1.14.2:
+prettier@^1.14.2, prettier@^1.19.1:
   version "1.19.1"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.19.1.tgz#f7d7f5ff8a9cd872a7be4ca142095956a60797cb"
   integrity sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==