import type { ProjectTaskDependencyEdge, TaskDependencySummary } from '@xopcai/gateway-contract';
import { type TaskAggregate } from './task-repository.js';
export type TaskDependencyErrorCode = 'not_found' | 'conflict' | 'invalid_dependency' | 'cycle';
export declare class TaskDependencyError extends Error {
    readonly code: TaskDependencyErrorCode;
    constructor(code: TaskDependencyErrorCode, message: string);
}
export declare class TaskDependencyService {
    #private;
    listDependencies(taskId: string): TaskDependencySummary[];
    listDependents(taskId: string): TaskDependencySummary[];
    listBlocking(taskId: string): TaskDependencySummary[];
    listProjectEdges(projectId: string): ProjectTaskDependencyEdge[];
    listReadyDependents(taskId: string): TaskAggregate[];
    replace(input: {
        taskId: string;
        dependsOnTaskIds: string[];
        expectedVersion: number;
        now?: number;
    }): TaskAggregate;
    private listRelated;
}