/**
 * @TODO move this to some shared package, currently copied from Grafana core (app/api/utils)
 */
export declare const getAPINamespace: () => string;
export declare const getAPIBaseURL: (group: string, version: string) => `${string}/apis/${string}/${string}/namespaces/${string}`;
export declare const getAPIReducerPath: (group: string, version: string) => `${string}/${string}`;
/**
 * Check if a string is well-formed UTF-16 (no lone surrogates).
 * encodeURIComponent() throws an error for lone surrogates
 */
export declare const isWellFormed: (str: string) => boolean;
/**
 * Base64URL encode a string using native browser APIs.
 * Handles Unicode characters correctly by using TextEncoder.
 * Converts standard base64 to base64url by replacing + with -, / with _, and removing padding.
 * @throws Error if the input string contains lone surrogates (malformed UTF-16)
 */
export declare const base64UrlEncode: (value: string) => string;