Function supportsRecursiveWatch

src/sync/watcher.ts:126–128

* Native recursive `fs.watch` is only reliable on macOS and Windows; on Linux * (and AIX) it throws `ERR_FEATURE_UNAVAILABLE_ON_PLATFORM`. We branch on this * to pick the recursive vs per-directory strategy.

()

 * to pick the recursive vs per-directory strategy.
 */
function supportsRecursiveWatch(): boolean {
  return process.platform === 'darwin' || process.platform === 'win32';
}

/**
 * Indirection over `fs.watch` so tests can inject a fake that throws or emits