Fixed issue #488: npm run dev race condition

package.json

@@ -9,7 +9,7 @@
     "test-watch": "npm test -- --watch",
     "test-e2e": "cross-env NODE_ENV=test BABEL_DISABLE_CACHE=1 mocha --retries 2 --compilers js:babel-register --require ./test/setup.js ./test/e2e.js",
     "lint": "eslint --format=node_modules/eslint-formatter-pretty app test *.js",
-    "hot-server": "cross-env NODE_ENV=development node -r babel-register server.js",
+    "hot-server": "cross-env NODE_ENV=development node --max_old_space_size=2096 -r babel-register server.js",
     "build-main": "cross-env NODE_ENV=production node -r babel-register ./node_modules/webpack/bin/webpack --config webpack.config.electron.js --progress --profile --colors",
     "build-renderer": "cross-env NODE_ENV=production node -r babel-register ./node_modules/webpack/bin/webpack --config webpack.config.production.js --progress --profile --colors",
     "build": "npm run build-main && npm run build-renderer",
@@ -18,7 +18,7 @@
     "package": "cross-env NODE_ENV=production node -r babel-register -r babel-polyfill package.js",
     "package-all": "npm run package -- --all",
     "postinstall": "node node_modules/fbjs-scripts/node/check-dev-engines.js package.json",
-    "dev": "concurrently --kill-others \"npm run hot-server\" \"npm run start-hot\"",
+    "dev": "npm run hot-server",
     "cleanup": "mop -v"
   },
   "bin": {

server.js

@@ -9,6 +9,7 @@ import express from 'express';
 import webpack from 'webpack';
 import webpackDevMiddleware from 'webpack-dev-middleware';
 import webpackHotMiddleware from 'webpack-hot-middleware';
+import { exec } from 'child_process';
 
 import config from './webpack.config.development';
 
@@ -29,10 +30,20 @@ app.use(webpackHotMiddleware(compiler));
 
 const server = app.listen(PORT, 'localhost', err => {
   if (err) {
-    console.error(err);
-    return;
+    return console.error(err);
   }
 
+  exec('npm run start-hot', (_error, stdout, stderr) => {
+    if (_error) {
+      return console.error(`exec error: ${_error}`);
+    }
+
+    return [
+      console.log(`stdout: ${stdout}`),
+      console.log(`stderr: ${stderr}`)
+    ];
+  });
+
   console.log(`Listening at http://localhost:${PORT}`);
 });