type Vec3 = [number, number, number];
/**
 * ProjectileSystem.ts
 *
 * Projectile management: spawning, travel, lifetime,
 * homing behavior, piercing, and impact callbacks.
 *
 * @module combat
 */
export interface ProjectileConfig {
    speed: number;
    lifetime: number;
    damage: number;
    homing: boolean;
    homingStrength: number;
    piercing: number;
    gravity: number;
}
export interface Projectile {
    id: string;
    x: number;
    y: number;
    z: number;
    vx: number;
    vy: number;
    vz: number;
    position: Vec3;
    velocity: Vec3;
    config: ProjectileConfig;
    age: number;
    hitCount: number;
    alive: boolean;
    ownerId: string;
}
export type ImpactCallback = (projectile: Projectile, targetId: string) => void;
export interface ProjectileTarget {
    id: string;
    position?: Vec3;
    x?: number;
    y?: number;
    z?: number;
    radius: number;
}
export declare class ProjectileSystem {
    private projectiles;
    private nextId;
    private onImpact;
    spawn(ownerId: string, x: number, y: number, z: number, dx: number, dy: number, dz: number, config: ProjectileConfig): string;
    setImpactCallback(cb: ImpactCallback): void;
    update(dt: number, targets?: ProjectileTarget[]): void;
    private findNearest;
    getProjectile(id: string): Projectile | undefined;
    getAliveCount(): number;
    cleanup(): void;
}
export {};
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