Function getGitIndexMtime

src/hooks/fileSuggestions.ts:138–147

* Stat .git/index to detect git state changes without spawning git ls-files. * Returns null for worktrees (.git is a file → ENOTDIR), fresh repos with no * index yet (ENOENT), and non-git dirs — caller falls back to time throttle.

()

 * index yet (ENOENT), and non-git dirs — caller falls back to time throttle.
 */
function getGitIndexMtime(): number | null {
  const repoRoot = findGitRoot(getCwd())
  if (!repoRoot) return null
  try {
    // eslint-disable-next-line custom-rules/no-sync-fs -- mtimeMs is the operation here, not a pre-check. findGitRoot above already stat-walks synchronously; one more stat is marginal vs spawning git ls-files on every keystroke. Async would force startBackgroundCacheRefresh to become async, breaking the synchronous fileListRefreshPromise contract at the cold-start await site.
    return statSync(path.join(repoRoot, '.git', 'index')).mtimeMs
  } catch {
    return null
  }
}

/**
 * Normalize git paths relative to originalCwd