add tests

.gitignore

@@ -0,0 +1 @@
+node_modules

examples/one.ts

@@ -0,0 +1,23 @@
+const obj = {
+  one: 1,
+  two: 2,
+  three: 3,
+}
+
+;('this config avoids semicolons at the end of statements and uses single quotes for strings')
+
+async function heresAFunctionWhichSpansMulitpleLinesAnd(
+  that,
+  includes,
+  many,
+  args,
+  to,
+  demonstrait,
+  trailing,
+  func,
+  commas
+) {
+  return obj
+}
+
+const arrowFunctions = avoidParens => 1

package.json

@@ -13,6 +13,11 @@
   "author": "GitHub Inc.",
   "main": "index.js",
   "scripts": {
+    "test:update": "prettier --config ./index.js --write examples/",
+    "test": "prettier --config ./index.js --check examples/",
     "postpublish": "npm publish --ignore-scripts --@github:registry='https://npm.pkg.github.com'"
+  },
+  "devDependencies": {
+    "prettier": "^2.8.0"
   }
 }