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tools/runServer.js

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+import path from 'path';
+import cp from 'child_process';
+import webpackConfig from './webpack.config';
+
+// Should match the text string used in `src/server.js/server.listen(...)`
+const RUNNING_REGEXP = /The server is running at http:\/\/(.*?)\//;
+
+let server;
+const { output } = webpackConfig.find(x => x.target === 'node');
+const serverPath = path.join(output.path, output.filename);
+
+// Launch or restart the Node.js server
+function runServer() {
+  return new Promise(resolve => {
+    let pending = true;
+
+    function onStdOut(data) {
+      const time = new Date().toTimeString();
+      const match = data.toString('utf8').match(RUNNING_REGEXP);
+
+      process.stdout.write(time.replace(/.*(\d{2}:\d{2}:\d{2}).*/, '[$1] '));
+      process.stdout.write(data);
+
+      if (match) {
+        server.host = match[1];
+        server.stdout.removeListener('data', onStdOut);
+        server.stdout.on('data', x => process.stdout.write(x));
+        pending = false;
+        resolve(server);
+      }
+    }
+
+    if (server) {
+      server.kill('SIGTERM');
+    }
+
+    server = cp.spawn('node', [serverPath], {
+      env: Object.assign({ NODE_ENV: 'development' }, process.env),
+      silent: false,
+    });
+
+    if (pending) {
+      server.once('exit', (code, signal) => {
+        if (pending) {
+          throw new Error(`Server terminated unexpectedly with code: ${code} signal: ${signal}`);
+        }
+      });
+    }
+
+    server.stdout.on('data', onStdOut);
+    server.stderr.on('data', x => process.stderr.write(x));
+
+    return server;
+  });
+}
+
+process.on('exit', () => {
+  if (server) {
+    server.kill('SIGTERM');
+  }
+});
+
+export default runServer;