diff --git a/package.json b/package.json
index 1816d16..172e588 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,7 @@
     "build:css": "mkdir -p dist && cp ./src/styles.css ./dist/styles.css",
     "build:js": "tsc",
     "clean": "rimraf dist",
+    "format": "prettier --write 'src/**/*' 'demo/src/**/*'",
     "prepare": "npm run clean && npm run build",
     "start": "tsc -w"
   },
@@ -32,6 +33,7 @@
     "jsdom": "^9.0.0",
     "mocha": "^3.3.0",
     "npm-run-all": "^4.1.5",
+    "prettier": "^1.17.0",
     "react": "^15.4.0",
     "react-addons-test-utils": "^15.0.2",
     "react-dom": "^15.4.0",
diff --git a/yarn.lock b/yarn.lock
index fbf9380..c2d8fe4 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1124,6 +1124,11 @@ prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
 
+prettier@^1.17.0:
+  version "1.17.0"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.17.0.tgz#53b303676eed22cc14a9f0cec09b477b3026c008"
+  integrity sha512-sXe5lSt2WQlCbydGETgfm1YBShgOX4HxQkFPvbxkcwgDvGDeqVau8h+12+lmSVlP3rHPz0oavfddSZg/q+Szjw==
+
 process-nextick-args@~1.0.6:
   version "1.0.7"
   resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-1.0.7.tgz#150e20b756590ad3f91093f25a4f2ad8bff30ba3"