import { Message } from "@truffle/dashboard-message-bus-common";
export interface MessageBusConnectionErrorOptions {
    message: string;
    cause?: Error;
}
export interface AlreadyRespondedErrorOptions {
    serviceBusMessage: Message;
}
export declare class AlreadyRespondedError extends Error {
    constructor({ serviceBusMessage }: AlreadyRespondedErrorOptions);
}
export declare class MessageBusConnectionError extends Error {
    cause: Error | undefined;
    constructor({ message, cause }: MessageBusConnectionErrorOptions);
    toString(): string;
}