/**
 * Classifies network/HTTP errors into standardized cancellation reason categories.
 * Pure function with no side effects - suitable for unit testing.
 *
 * ADO 6373382: Diagnostic telemetry for ChatConfigRetrievalFailure
 */
/**
 * Standardized cancellation reason categories for network errors
 */
export type CancellationReason = 'timeout' | 'request_cancelled' | 'browser_offline' | 'dns_lookup_failed' | 'connection_timeout' | 'connection_refused' | 'network_error_no_response' | 'server_error' | 'client_error' | 'unknown';
/**
 * Classifies an error object into a standardized cancellation reason category.
 *
 * @param error The error object to classify (typically from axios or fetch)
 * @param online Browser's online status (navigator.onLine) - optional
 * @returns A standardized cancellation reason string
 *
 * @example
 * ```typescript
 * const error = { code: 'ECONNABORTED' };
 * const reason = classifyNetworkError(error, true);
 * // Returns: 'timeout'
 * ```
 */
export declare function classifyNetworkError(error: unknown, online?: boolean): CancellationReason;