start-backend-server.ts

async function startBackendServer(options: ServeFullstackExecutorSchema) {
  let frontendServerStarted = false;
  return new Promise(() => {
    const childProcess = exec(`npx nx serve ${options.backendProject}`, {
      maxBuffer: LARGE_BUFFER,
    });
    process.on('exit', () => childProcess.kill());
    process.on('SIGTERM', () => childProcess.kill());
    childProcess.stdout.on('data', (data) => {
      if (!frontendServerStarted && data.includes('build succeeded, watching for changes...')) {
        startFrontendServer(options.frontendProject, targetPadSize);
        frontendServerStarted = true;
      }
    });
  });
}