import type { RoleName } from '../models/common';
/** Valid role names */
export declare const VALID_ROLES: RoleName[];
/**
 * Check if a given string is a valid role name (case-insensitive).
 */
export declare function isValidRole(role: string): role is RoleName;
/**
 * Normalize a role name to canonical case.
 */
export declare function normalizeRole(role: string): RoleName | null;
/**
 * Validate that an owner role string is a valid role name (case-insensitive).
 *
 * v2: Basic role-name validation only — no stage-based captain-only rules.
 * Returns the normalized role name on success.
 *
 * @param owner - The owner role to validate
 * @returns The canonical role name
 * @throws TaskInvalidOwnerError with closest-match suggestions if invalid
 */
export declare function validateOwnerRole(owner: string): RoleName;
/**
 * Validate that an owner can own a task in a given stage.
 *
 * v2: No captain-only restrictions. Any valid role can own a task in any stage.
 * Kept for API compatibility — delegates to validateOwnerRole.
 *
 * @param owner - The task owner role
 * @param _stage - The task stage (unused in v2)
 */
export declare function validateOwnerForStage(owner: string, _stage?: unknown): void;
export { validateOwnerForStage as validateOwnerForState };
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