Revert yarn prettier addition in yarn ci-check (facebook#543)

Author: yangshun

.gitignore

@@ -14,3 +14,5 @@ website/node_modules
 website/package-lock.json
 website/translated_docs
 website/yarn.lock
+
+yarn-error.log

lib/start-server.js

@@ -37,18 +37,21 @@ const program = require('commander');
 
 program.option('--port <number>', 'Specify port number').parse(process.argv);
 
-var port = process.env.PORT || 3000;
-var numAttempts = 0;
-var maxAttempts = 10;
+let port = process.env.PORT || 3000;
+let numAttempts = 0;
+const MAX_ATTEMPTS = 10;
 checkPort();
 
 function checkPort() {
   tcpPortUsed
     .check(port, 'localhost')
     .then(function(inUse) {
-      if (inUse && numAttempts >= maxAttempts) {
-        console.log("Reached max attempts, exiting. Please open up some ports or increase the number of attempts and try again.")
-        process.exit(1)
+      if (inUse && numAttempts >= MAX_ATTEMPTS) {
+        console.log(
+          'Reached max attempts, exiting. Please open up some ports or ' +
+            'increase the number of attempts and try again.'
+        );
+        process.exit(1);
       } else if (inUse) {
         console.error(chalk.red('Port ' + port + ' is in use'));
         // Try again but with port + 1

package.json

@@ -14,7 +14,7 @@
     "url": "https://github.com/facebook/Docusaurus.git"
   },
   "scripts": {
-    "ci-check": "yarn prettier && yarn prettier:diff",
+    "ci-check": "yarn prettier:diff",
     "format:source": "prettier --config .prettierrc --write \"lib/**/*.js\"",
     "format:examples": "prettier --config .prettierrc --write \"examples/**/*.js\"",
     "nit:source": "prettier --config .prettierrc --list-different \"lib/**/*.js\"",