export type MutationState = 'not_attempted' | 'unknown' | 'confirmed_failed';
export interface OperationErrorDetails {
    code: string;
    operation: string;
    endpoint: string;
    httpStatus?: number;
    requestId?: string;
    retryable: boolean;
    mutationState: MutationState;
    contentType?: string;
}
export declare class DuctapeOperationError extends Error {
    readonly details: OperationErrorDetails;
    constructor(message: string, details: OperationErrorDetails, options?: ErrorOptions);
    toJSON(): Record<string, unknown>;
}
export declare function safeEndpoint(value: string): string;