export declare function formatError(error: unknown): string;
export declare function logError(context: string, error: unknown): void;
export declare function logInfo(message: string): void;
export declare function logDebug(message: string): void;
export declare function logWarn(message: string): void;
/**
 * Check if an error is a network error and return a user-friendly message
 */
export declare function isNetworkError(error: unknown): string | null;
/**
 * Check if an error is an authentication error (401 or token expired)
 * Returns a user-friendly error message if it's an auth error, null otherwise
 */
export declare function isAuthError(error: unknown): string | null;
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