import type { TaskStatus } from '../models/common';
/** Valid task status values — Blocked permanently removed */
export declare const VALID_TASK_STATUSES: TaskStatus[];
/**
 * Check if a given string is a valid TaskStatus value (case-insensitive).
 */
export declare function isValidTaskStatus(status: string): status is TaskStatus;
/**
 * Normalize a status value to canonical case.
 */
export declare function normalizeTaskStatus(status: string): TaskStatus | null;
/**
 * Get all allowed target statuses from a given current status.
 */
export declare function getAllowedTaskTransitions(current: TaskStatus): TaskStatus[];
/**
 * Check if a transition from current to target is valid.
 */
export declare function isValidTaskTransition(current: TaskStatus, target: TaskStatus): boolean;
/**
 * Get the auto timestamps for a task state transition.
 * - Any -> In Progress: set started_at (if not already set)
 * - Any -> Done: set completed_at
 */
export declare function getTaskAutoTimestamps(current: TaskStatus, target: TaskStatus): {
    started_at?: string;
    completed_at?: string;
};
export declare const CAPTAIN_ONLY_STAGES: string[];
export declare const CAPTAIN_ONLY_STATES: string[];
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