fix: Prettier

package.json

@@ -16,7 +16,8 @@
     "build": "babel src --out-dir dist --ignore __tests__",
     "prepublish": "cross-env NODE_ENV=production npm run build",
     "dev": "babel -w src --out-dir dist --ignore __tests__",
-    "test": "xo && ava",
+    "format": "prettier-check --ignore-path .gitignore {src,.}/*.js",
+    "test": "prettier-check --ignore-path .gitignore {src,.}/*.js && ava",
     "pretest": "npm run build",
     "semantic-release": "semantic-release",
     "postinstall": "opencollective postinstall"
@@ -38,6 +39,7 @@
     "apollo-cache-inmemory": "^1.2.10",
     "apollo-client": "^2.4.2",
     "apollo-link-http": "^1.5.5",
+    "ava": "^0.25.0",
     "child_process": "^1.0.2",
     "dot-prop": "^4.2.0",
     "execa": "^0.9.0",
@@ -50,6 +52,8 @@
     "ink-text-input": "^1.1.1",
     "meow": "^4.0.0",
     "opencollective": "^1.0.3",
+    "prettier": "^1.14.2",
+    "prettier-check": "^2.0.0",
     "react": "^16.5.1",
     "react-apollo": "^2.1.11",
     "react-dom": "^16.5.1",

prettier.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+  semi: false,
+  singleQuote: true,
+  trailingComma: 'all',
+}