/**
 * AchievementSystem.ts
 *
 * Achievement tracking: conditions, unlock, progress,
 * tiers, notifications, and persistence.
 *
 * @module gameplay
 */
export type AchievementRarity = 'bronze' | 'silver' | 'gold' | 'platinum' | 'diamond';
export interface AchievementDef {
    id: string;
    name: string;
    description: string;
    icon: string;
    rarity: AchievementRarity;
    maxProgress: number;
    currentProgress: number;
    unlocked: boolean;
    unlockedAt: number | null;
    hidden: boolean;
    category: string;
}
export declare class AchievementSystem {
    private achievements;
    private listeners;
    private totalPoints;
    private static readonly RARITY_POINTS;
    register(config: Omit<AchievementDef, 'currentProgress' | 'unlocked' | 'unlockedAt'>): AchievementDef;
    addProgress(id: string, amount?: number): boolean;
    unlock(id: string): boolean;
    onUnlock(listener: (achievement: AchievementDef) => void): void;
    get(id: string): AchievementDef | undefined;
    getAll(): AchievementDef[];
    getUnlocked(): AchievementDef[];
    getLocked(): AchievementDef[];
    getByCategory(cat: string): AchievementDef[];
    getByRarity(rarity: AchievementRarity): AchievementDef[];
    getCount(): number;
    getUnlockedCount(): number;
    getTotalPoints(): number;
    getCompletionPercent(): number;
    getProgress(id: string): number;
}
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