diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 0000000..559e8cc
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,10 @@
+{
+  "printWidth": 80,
+  "tabWidth": 2,
+  "useTabs": false,
+  "semi": true,
+  "singleQuote": false,
+  "trailingComma": "es5",
+  "arrowParens": "always",
+  "endOfLine": "lf"
+}
diff --git a/package.json b/package.json
index b04ae78..d0d976b 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
     "build:cjs": "tsc -p tsconfig.json --target ESNext --module commonjs --outDir lib",
     "build:esm": "tsc -p tsconfig.json --target ESNext --module ESNext --outDir esm",
     "typecheck": "tsc -p tsconfig.json --noEmit",
+    "format": "prettier --write \"src/**/*.ts\" \"__tests__/**/*.ts\"",
     "lint": "npm run typecheck && prettier --check \"src/**/*.ts\" \"__tests__/**/*.ts\"",
     "build": "rm -rf esm lib && run-p build:*",
     "clean": "rm -rf lib esm",