import { GasFreeError } from './GasFreeError';
export declare class ServiceUnavailableError extends GasFreeError {
    readonly serviceUrl: string;
    readonly statusCode?: number;
    readonly retriesAttempted?: number;
    constructor(serviceUrl: string, message?: string, statusCode?: number, retriesAttempted?: number, originalError?: Error);
    static timeout(serviceUrl: string, timeoutMs: number, retriesAttempted?: number): ServiceUnavailableError;
    static httpError(serviceUrl: string, statusCode: number, statusText?: string): ServiceUnavailableError;
    toJSON(): Record<string, unknown>;
}
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