import { CallExtraData } from './utils/call-extra-data';
/** takes variant response #err(#SomeError(<payload>)) and transforms to readable text: "#SomeError: <payload json>"*/
export declare class HplError<T = any> extends Error {
    readonly callExtra: CallExtraData;
    errorKey: 'SysFatal' | 'SysTransient' | 'DestinationInvalid' | 'CanisterError' | 'CanisterReject' | string;
    errorPayload: any;
    constructor(errObject: T, callExtra: CallExtraData);
    isTrapped(): boolean;
    isErrorRejectThrown(): boolean;
    toString(): string;
}