export class PathUtils {
  static normalizeRelative(path) {
    if (!path || path.startsWith("/") || path.includes("\\")) {
      throw new Error("Invalid path format");
    }
    const parts = path.split("/");
    const out = [];
    for (const part of parts) {
      if (!part || part === ".") continue;
      if (part === "..") throw new Error("Path traversal is forbidden");
      out.push(part);
    }
    return out.join("/");
  }

  static dirname(path) {
    const index = path.lastIndexOf("/");
    return index === -1 ? "" : path.slice(0, index);
  }

  static basename(path) {
    const index = path.lastIndexOf("/");
    return index === -1 ? path : path.slice(index + 1);
  }
}