start-dev.js

const { spawn } = require('child_process');
const path = require('path');

console.log('🚀 Starting Lin Development Environment...');
console.log('==========================================\n');

// Start backend process
console.log('🔧 Starting Backend Server...');
const backend = spawn('python', ['app.py'], {
  cwd: path.join(__dirname, 'backend'),
  stdio: 'inherit',
  shell: true
});

// Start frontend process
console.log('🎨 Starting Frontend Development Server...');
const frontend = spawn('npm', ['run', 'dev'], {
  cwd: path.join(__dirname, 'frontend'),
  stdio: 'inherit',
  shell: true
});

// Handle process events
backend.on('close', (code) => {
  console.log(`Backend process exited with code ${code}`);
  frontend.kill();
});

frontend.on('close', (code) => {
  console.log(`Frontend process exited with code ${code}`);
  backend.kill();
});

// Handle exit signals
process.on('SIGINT', () => {
  console.log('\n🛑 Shutting down development servers...');
  backend.kill();
  frontend.kill();
  process.exit(0);
});

process.on('SIGTERM', () => {
  console.log('\n🛑 Shutting down development servers...');
  backend.kill();
  frontend.kill();
  process.exit(0);
});