/**
 * Persisted orchestration metadata for the currently active child task of a
 * {@link MultiStepPayload multi-step workflow}.
 */
export declare class ActiveChildState {
    /**
     * Persistent id of the spawned child task.
     */
    readonly taskId: number;
    /**
     * Whether parent workflow may continue from `childFailed(...)` when this child
     * reaches terminal `error`.
     *
     * This flag does not change the child task status itself.
     */
    readonly allowFailure: boolean;
    constructor(
    /**
     * Persistent id of the spawned child task.
     */
    taskId: number, 
    /**
     * Whether parent workflow may continue from `childFailed(...)` when this child
     * reaches terminal `error`.
     *
     * This flag does not change the child task status itself.
     */
    allowFailure?: boolean);
    /**
     * Create a shallow copy with selected fields replaced.
     *
     * @param o replacement fields
     * @returns copied state with overrides applied
     */
    copy(o: Partial<ActiveChildState>): ActiveChildState;
    /**
     * Serialize active child state into plain JSON for task payload persistence.
     *
     * @returns plain object suitable for embedding into {@link MultiStepPayload.toJson}
     */
    get toJson(): object;
    /**
     * Deserialize active child state from plain JSON payload.
     *
     * @param j serialized active-child payload
     * @returns parsed active-child state or `none` if the payload does not contain one
     */
    static fromJson(j: unknown): import("scats").Option<ActiveChildState>;
}