export const DEFAULT_EXCLUDED_PATHS = ["node_modules", ".git", "dist", "build"] as const;

export function effectiveExcludedPaths(...sources: ReadonlyArray<readonly string[] | undefined>): string[] {
  const merged = new Set<string>(DEFAULT_EXCLUDED_PATHS);
  for (const source of sources) for (const path of source ?? []) {
    const normalized = path.trim().replace(/^\.\//, "").replace(/[\\/]+$/, "");
    if (normalized) merged.add(normalized);
  }
  return [...merged].sort();
}