Add a Prettier task (#88)

* Add a Prettier task

* Add docs for setting up Prettier in an app

* Update Prettier readme

* Update Prettier docs

* Don't write files with Prettier by default

* Upgrade Prettier

* Bump minor version 7.3.0

docs/PRETTIER.md

@@ -0,0 +1,11 @@
+# Prettier
+
+## Adding Prettier to an App
+
+Prettier is available in @trunkclub/build version 7.3 and above.
+
+### Usage
+
+```bash
+yarn tcweb-build prettier -- --write "{src,spec}/**/*.{js,jsx,es6}"
+```

packages/react-scripts/bin/react-scripts.js

@@ -25,6 +25,7 @@ function run (s) {
   case 'test':
   case 'build-module':
   case 'lint':
+  case 'prettier':
   case 'publish':
   case 'deploy':
     var result = spawn.sync(

packages/react-scripts/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@trunkclub/build",
-  "version": "7.2.0",
+  "version": "7.3.0",
   "upstream-version": "0.9.5",
   "description": "Configuration and scripts for Create React App. Fork maintained by Trunk Club",
   "repository": "trunkclub/create-react-app",
@@ -71,6 +71,7 @@
     "object-assign": "4.1.1",
     "path-exists": "2.1.0",
     "postcss-loader": "1.2.2",
+    "prettier": "^1.4.4",
     "progress-bar-webpack-plugin": "1.9.0",
     "promise": "7.1.1",
     "recursive-readdir": "2.1.0",
@@ -89,11 +90,16 @@
   "devDependencies": {
     "babel-runtime": "^6.11.6",
     "bundle-deps": "1.0.0",
-    "flow-runtime": "^0.12.0",
+    "husky": "^0.13.3",
+    "lint-staged": "^3.4.1",
     "publish": "^0.6.0",
     "react": "^15.3.0",
     "react-dom": "^15.3.0"
   },
+  "peerDependencies": {
+    "husky": "^0.13.3",
+    "lint-staged": "^3.4.1"
+  },
   "optionalDependencies": {
     "fsevents": "1.0.17"
   }

packages/react-scripts/scripts/prettier.js

@@ -0,0 +1,39 @@
+'use strict';
+
+var path = require('path');
+var spawn = require('cross-spawn');
+
+// First two args will always be:
+//   - node
+//   - path/to/prettier.js (this file)
+var argsIndex = process.argv[2] === '--' ? 3 : 2;
+var args = process.argv.slice(argsIndex);
+
+var result = spawn.sync(
+  path.resolve(__dirname, '../node_modules/.bin/prettier'),
+  [
+    '--single-quote',
+    '--no-semi',
+    '--trailing-comma', 'all',
+  ].concat(args),
+  { stdio: 'inherit' }
+);
+
+if (result.signal) {
+  if (result.signal === 'SIGKILL') {
+    console.log(
+      'The prettier task failed because the process exited too early. ' +
+        'This probably means the system ran out of memory or someone called ' +
+        '`kill -9` on the process.'
+    );
+  } else if (result.signal === 'SIGTERM') {
+    console.log(
+      'The prettier task failed because the process exited too early. ' +
+        'Someone might have called `kill` or `killall`, or the system could ' +
+        'be shutting down.'
+    );
+  }
+  process.exit(1);
+}
+
+process.exit(result.status);