export type WorkflowInfrastructureFault = "worker_lost" | "worker_cleanup_unconfirmed" | "worker_retry_limit" | "worker_startup_failed" | "stale_work_lease" | "intercom_unavailable" | "storage_unavailable";
export declare class WorkflowInfrastructureError extends Error {
    readonly name = "WorkflowInfrastructureError";
    readonly retryable = true;
    readonly code: WorkflowInfrastructureFault;
    constructor(code: WorkflowInfrastructureFault, message: string, options?: ErrorOptions);
}
export declare function isRetryableWorkflowError(error: unknown): boolean;
export declare function workflowInfrastructureFault(message: string): WorkflowInfrastructureFault | undefined;
export declare function asWorkflowInfrastructureError(error: unknown): WorkflowInfrastructureError | undefined;