dev-watch.js

/* eslint-disable */
const { spawn } = require('child_process');
const fs = require('fs');
const path = require('path');

/**
 * Simple file watcher for ramps-controller development
 * Watches src/ directory and runs link script on changes
 */

const srcDir = path.join(__dirname, 'src');
const linkScript = path.join(__dirname, 'link-ramp-controller.js');

console.log('👀 Watching ramps-controller src/ directory...');
console.log('📁 Press Ctrl+C to stop watching\n');

// Keep track of last build time to avoid rapid rebuilds
let lastBuildTime = 0;
const BUILD_THROTTLE_MS = 500; // Wait 500ms after last change before building

// Function to run the link script
function runLinkScript() {
  return new Promise((resolve, reject) => {
    console.log('🔄 Changes detected, rebuilding and linking...');
    const child = spawn('node', [linkScript], {
      stdio: 'inherit',
      cwd: __dirname,
    });

    child.on('close', (code) => {
      if (code !== 0) {
        console.error(`❌ Failed to rebuild and link (exit code ${code})`);
        reject(new Error(`Link script exited with code ${code}`));
      } else {
        console.log('✅ Rebuild and link complete\n');
        console.log('👀 Watching for changes...\n');
        resolve();
      }
    });

    child.on('error', (error) => {
      console.error('❌ Failed to spawn link script:', error.message);
      reject(error);
    });
  });
}

// Simple file watcher using fs.watch
function watchDirectory(dir) {
  fs.watch(dir, { recursive: true }, (_eventType, filename) => {
    if (filename && (filename.endsWith('.ts') || filename.endsWith('.js'))) {
      const now = Date.now();
      if (now - lastBuildTime > BUILD_THROTTLE_MS) {
        lastBuildTime = now;
        // Debounce the build to avoid multiple rapid builds
        setTimeout(async () => {
          if (Date.now() - lastBuildTime >= BUILD_THROTTLE_MS) {
            await runLinkScript();
          }
        }, BUILD_THROTTLE_MS);
      }
    }
  });
}

// Watch the src directory
watchDirectory(srcDir);

// Also watch the link script itself
fs.watchFile(linkScript, () => {
  console.log('🔄 Link script changed, will rebuild on next src change');
});

// Initial build and link
console.log('🏗️  Performing initial build and link...');
runLinkScript().catch(() => {
  // Initial build errors are handled within runLinkScript
});