/**
 * pi-task - Task Store (SQLite-backed Kanban)
 *
 * Pure data layer. No framework dependencies.
 * Uses sql.js (WebAssembly SQLite) for cross-runtime compatibility.
 * Works in both Node.js and Bun environments.
 */
import { type Database as SqlJsDatabase } from "sql.js";
export type TaskStatus = "backlog" | "needs-assignment" | "in-progress" | "needs-review" | "blocked" | "done";
export type TaskPriority = "low" | "medium" | "high" | "critical";
export interface Task {
    id: string;
    title: string;
    description: string;
    status: TaskStatus;
    priority: TaskPriority;
    assignee?: string;
    sessionId: string;
    parentId?: string;
    tags: string[];
    createdAt: number;
    updatedAt: number;
    completedAt?: number;
    metadata: Record<string, unknown>;
}
export interface TaskComment {
    id: string;
    taskId: string;
    author: string;
    content: string;
    timestamp: number;
}
export interface TaskHistoryEntry {
    id: string;
    taskId: string;
    fromStatus: string | null;
    toStatus: string;
    changedBy: string;
    timestamp: number;
    note: string;
}
export declare const TASK_COLUMNS: {
    id: TaskStatus;
    label: string;
    emoji: string;
}[];
/**
 * Initialize the task database.
 * Call with custom path for testing, or omit for default.
 * Must be called before any other operations.
 */
export declare function initDatabase(dbPath?: string): Promise<SqlJsDatabase>;
/**
 * Synchronous init for cases where sql.js is already loaded.
 * Prefer async initDatabase() when possible.
 */
export declare function initDatabaseSync(sqlJsModule: any, dbPath?: string): SqlJsDatabase;
/**
 * Close the database connection and save.
 */
export declare function closeDatabase(): void;
/**
 * Check if the database is initialized.
 */
export declare function isInitialized(): boolean;
/**
 * Create a new task.
 */
export declare function createTask(title: string, description?: string, options?: Partial<Pick<Task, "status" | "priority" | "assignee" | "sessionId" | "parentId" | "tags" | "metadata">>, sessionId?: string): Task;
/**
 * Get a task by ID (exact match or prefix).
 */
export declare function getTask(id: string): Task | null;
/**
 * Update task status. Records history.
 */
export declare function updateTaskStatus(id: string, newStatus: TaskStatus, note?: string, changedBy?: string): boolean;
/**
 * Assign a task. Moves to in-progress if in backlog/needs-assignment.
 */
export declare function assignTask(id: string, assignee: string, changedBy?: string): boolean;
/**
 * Add a comment to a task.
 */
export declare function addComment(taskId: string, content: string, author?: string): boolean;
/**
 * Get comments for a task.
 */
export declare function getComments(taskId: string): TaskComment[];
/**
 * List tasks with optional filters.
 */
export declare function listTasks(filter?: {
    status?: TaskStatus;
    sessionId?: string;
    assignee?: string;
}): Task[];
/**
 * Get full kanban board.
 */
export declare function getBoard(): Record<TaskStatus, Task[]>;
/**
 * Delete a task.
 */
export declare function deleteTask(id: string): boolean;
/**
 * Get task history.
 */
export declare function getTaskHistory(taskId: string): TaskHistoryEntry[];