/**
 * StatusEffects.ts
 *
 * Buff/debuff system: stacking, duration, ticking effects,
 * stat modifiers, immunity, and cleansing.
 *
 * @module combat
 */
export type EffectType = 'buff' | 'debuff';
export type StackBehavior = 'stack' | 'refresh' | 'replace' | 'ignore';
export interface StatModifier {
    stat: string;
    flat: number;
    percent: number;
}
export interface StatusEffect {
    id: string;
    name: string;
    type: EffectType;
    duration: number;
    elapsed: number;
    stacks: number;
    maxStacks: number;
    stackBehavior: StackBehavior;
    modifiers: StatModifier[];
    tickInterval: number;
    lastTick: number;
    tickDamage: number;
    onApply?: string;
    onRemove?: string;
    onTick?: string;
}
export declare class StatusEffectSystem {
    private effects;
    private immunities;
    private tickResults;
    apply(entityId: string, effectDef: Omit<StatusEffect, 'id' | 'elapsed' | 'lastTick' | 'stacks'> & {
        stacks?: number;
    }): StatusEffect | null;
    remove(entityId: string, effectName: string): boolean;
    removeAllOfType(entityId: string, type: EffectType): number;
    cleanse(entityId: string, _count?: number): number;
    update(dt: number): void;
    getTickResults(): typeof this.tickResults;
    addImmunity(entityId: string, effectName: string): void;
    removeImmunity(entityId: string, effectName: string): void;
    getStatModifiers(entityId: string, stat: string): {
        flat: number;
        percent: number;
    };
    applyStatModifiers(entityId: string, stat: string, baseValue: number): number;
    getEffects(entityId: string): StatusEffect[];
    hasEffect(entityId: string, effectName: string): boolean;
    getEffectCount(entityId: string): number;
}
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