import { AxiosError } from 'axios';
/** Custom Error class for Unlayer API errors */
export declare class UnlayerApiError extends Error {
    readonly statusCode?: number;
    readonly responseData?: unknown;
    readonly requestData?: unknown;
    readonly isUnlayerApiError = true;
    constructor(message: string, statusCode?: number, responseData?: unknown, requestData?: unknown);
}
/**
 * Type guard to check if an error is an instance of UnlayerApiError.
 * @param error - The error to check.
 * @returns True if the error is an UnlayerApiError, false otherwise.
 */
export declare function isUnlayerApiError(error: unknown): error is UnlayerApiError;
/**
 * Parses AxiosError and throws a standardized UnlayerApiError.
 * This function guarantees to throw, indicated by the `never` return type.
 * @param error - The error caught from an Axios request.
 */
export declare function handleApiError(error: AxiosError | Error): never;