Function detectWindowsFragility

scripts/test-free-shards.ts:127–138

(absolutePath: string)

 * Returns the first POSIX-only pattern hit in the file, or null if Windows-safe.
 */
export function detectWindowsFragility(absolutePath: string): { reason: string } | null {
  let content: string;
  try {
    content = fs.readFileSync(absolutePath, 'utf-8');
  } catch {
    return null;
  }
  for (const { pattern, reason } of WINDOWS_FRAGILE_PATTERNS) {
    if (pattern.test(content)) return { reason };
  }
  return null;
}

function walkTestFiles(dirPath: string): string[] {
  const entries = fs.readdirSync(dirPath, { withFileTypes: true });