import { Core, type Milestone, type Task } from '@backlog-md/core';
/** State for a single milestone with its tasks */
export interface MilestoneState {
    milestone: Milestone;
    tasks: Task[];
    isLoading: boolean;
    isExpanded: boolean;
}
export interface UseMilestoneDataResult {
    milestones: MilestoneState[];
    isLoading: boolean;
    error: string | null;
    /** Expand a milestone and load its tasks */
    expandMilestone: (milestoneId: string) => Promise<void>;
    /** Collapse a milestone */
    collapseMilestone: (milestoneId: string) => void;
    /** Toggle milestone expansion */
    toggleMilestone: (milestoneId: string) => Promise<void>;
    /** Refresh all data */
    refreshData: () => Promise<void>;
}
interface UseMilestoneDataOptions {
    /** Shared Core instance from useBacklogCore (required) */
    core: Core | null;
}
/**
 * Hook for managing milestone data with lazy task loading
 *
 * Milestones are loaded on init with their task IDs.
 * Task content is only loaded when a milestone is expanded.
 *
 * Requires a shared Core instance from useBacklogCore.
 */
export declare function useMilestoneData(options: UseMilestoneDataOptions): UseMilestoneDataResult;
export {};
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