/**
 * Resolve callbackUrl with validation, logging, and fallback to location.href.
 * - Missing input: info log, fallback to current location.
 * - Invalid input (no protocol / unparseable): error log, fallback to current location.
 * - No browser environment: error log, no fallback.
 */
export declare function resolveCallbackUrl(raw?: string, context?: string): string | undefined;