import { RegionCode } from "../models";
/**
 * Extracts the region code from a base64-encoded NPID string and returns the region code.
 *
 * @param npId The base64-encoded NPID string, which is decoded to extract the region code.
 * @returns The ISO 3166-1 alpha-2 region code (e.g., "US", "JP", "GB") as a RegionCode,
 * or null if extraction fails or the NPID is invalid.
 *
 * This function assumes a valid NPID format (e.g., "VaultTec-Co@b7.us"). It splits the string to get
 * the region code (e.g., "us"), which is then returned as uppercase.
 */
export declare const extractRegionFromNpId: (npId: string) => RegionCode | null;