1  /**
 2   * Token Watch Script
 3   * Watches token JSON files and auto-rebuilds on change
 4   * Enables instant feedback loop for design iteration
 5   */
 6  
 7  import { watch } from 'fs';
 8  import { spawn, ChildProcess } from 'child_process';
 9  import { join, dirname } from 'path';
10  import { fileURLToPath } from 'url';
11  
12  const __dirname = dirname(fileURLToPath(import.meta.url));
13  const tokensDir = join(__dirname, '..', 'tokens');
14  
15  let buildProcess: ChildProcess | null = null;
16  let debounceTimer: NodeJS.Timeout | null = null;
17  
18  function runBuild() {
19    if (buildProcess) {
20      buildProcess.kill();
21    }
22  
23    console.log('\n\x1b[36m[tokens]\x1b[0m Rebuilding...');
24    const start = Date.now();
25  
26    buildProcess = spawn('tsx', ['scripts/build.ts'], {
27      cwd: join(__dirname, '..'),
28      stdio: 'inherit',
29      shell: true,
30    });
31  
32    buildProcess.on('close', (code) => {
33      if (code === 0) {
34        const duration = Date.now() - start;
35        console.log(`\x1b[32m[tokens]\x1b[0m Ready in ${duration}ms`);
36      }
37      buildProcess = null;
38    });
39  }
40  
41  function debouncedBuild() {
42    if (debounceTimer) {
43      clearTimeout(debounceTimer);
44    }
45    debounceTimer = setTimeout(runBuild, 100);
46  }
47  
48  // Watch all JSON files in tokens directory
49  const watchPaths = [
50    tokensDir,
51    join(tokensDir, 'themes'),
52  ];
53  
54  console.log('\x1b[36m[tokens]\x1b[0m Watching for changes...');
55  console.log(`\x1b[90m  ${tokensDir}\x1b[0m`);
56  console.log(`\x1b[90m  ${join(tokensDir, 'themes')}\x1b[0m\n`);
57  
58  // Initial build
59  runBuild();
60  
61  // Set up watchers
62  watchPaths.forEach(dir => {
63    watch(dir, { recursive: false }, (eventType, filename) => {
64      if (filename && filename.endsWith('.json')) {
65        console.log(`\x1b[90m[change]\x1b[0m ${filename}`);
66        debouncedBuild();
67      }
68    });
69  });
70  
71  // Handle graceful shutdown
72  process.on('SIGINT', () => {
73    console.log('\n\x1b[36m[tokens]\x1b[0m Stopping watch...');
74    if (buildProcess) buildProcess.kill();
75    process.exit(0);
76  });