/**
 * TaskRegistry, in-memory index for RuntimeTask lookup by ID, kind, status,
 * and parent/child relationships.
 *
 * This is a pure data structure with no side effects. The UnifiedTaskManager
 * owns the registry instance and is responsible for keeping it consistent with
 * the Zustand store.
 */
import type { RuntimeTask, TaskKind } from '../store/domains/tasks.js';
/**
 * TaskRegistry, provides O(1) task lookup by ID and O(k) lookup by kind,
 * running status, and parent task.
 *
 * All mutation methods return `this` for chaining.
 */
export declare class TaskRegistry {
    /** Primary task index keyed by task ID. */
    private readonly _tasks;
    /**
     * Registers a task in the registry. If a task with the same ID already
     * exists it is replaced (treated as an update).
     *
     * @param task - The RuntimeTask to register.
     */
    register(task: RuntimeTask): this;
    /**
     * Removes a task from the registry by ID.
     *
     * @param id - The task ID to remove.
     * @returns `true` if the task existed and was removed; `false` otherwise.
     */
    deregister(id: string): boolean;
    /**
     * Retrieves a task by its unique ID.
     *
     * @param id - The task ID to look up.
     * @returns The RuntimeTask if found, or `undefined`.
     */
    get(id: string): RuntimeTask | undefined;
    /**
     * Returns all tasks of a given kind.
     *
     * @param kind - The TaskKind to filter by.
     * @returns Array of matching RuntimeTask records (may be empty).
     */
    getByKind(kind: TaskKind): RuntimeTask[];
    /**
     * Returns all currently running tasks (status === 'running').
     *
     * @returns Array of RuntimeTask records with status 'running'.
     */
    getRunning(): RuntimeTask[];
    /**
     * Returns all tasks that are direct children of the given parent task ID.
     *
     * @param parentId - The parent task ID.
     * @returns Array of child RuntimeTask records (may be empty).
     */
    getChildren(parentId: string): RuntimeTask[];
    /**
     * Returns all tasks matching the given status.
     *
     * @param status - The lifecycle status to filter by.
     * @returns Array of RuntimeTask records with the given status.
     */
    getByStatus(status: RuntimeTask['status']): RuntimeTask[];
    /**
     * Returns the total number of tasks currently tracked in the registry.
     */
    get size(): number;
    /**
     * Returns a snapshot of all tasks as a new Map.
     * Mutations to the returned Map do not affect the registry.
     */
    snapshot(): Map<string, RuntimeTask>;
}
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