/**
 * ProgressionTree.ts
 *
 * Skill tree: nodes with prerequisites, point allocation,
 * tiers, respec, and tree traversal.
 *
 * @module gameplay
 */
export interface SkillNode {
    id: string;
    name: string;
    description: string;
    tier: number;
    maxLevel: number;
    currentLevel: number;
    cost: number;
    prerequisites: string[];
    unlocked: boolean;
    icon: string;
    category: string;
    effects: Record<string, number>;
}
export declare class ProgressionTree {
    private nodes;
    private availablePoints;
    private totalSpent;
    private respecCount;
    addNode(config: Omit<SkillNode, 'currentLevel' | 'unlocked'>): SkillNode;
    getNode(id: string): SkillNode | undefined;
    addPoints(amount: number): void;
    getAvailablePoints(): number;
    getTotalSpent(): number;
    invest(id: string, levels?: number): boolean;
    canInvest(id: string, levels?: number): boolean;
    private checkUnlock;
    private recheckAll;
    respec(): void;
    getRespecCount(): number;
    getByTier(tier: number): SkillNode[];
    getByCategory(cat: string): SkillNode[];
    getUnlocked(): SkillNode[];
    getInvested(): SkillNode[];
    getNodeCount(): number;
    getEffectTotal(stat: string): number;
    getTiers(): number[];
}
//# sourceMappingURL=ProgressionTree.d.ts.map