import { Particle } from '../entities/Particle';
import type { Edge } from '../entities/Edge';
export declare class ParticleSystem {
    private pool;
    /** edgeId → particles on that edge */
    private edgeParticles;
    /** Override particle count for all edges */
    private _globalCount;
    setGlobalParticleCount(count: number | undefined): void;
    /** Called when the edge list changes. Reconciles particle assignments. */
    syncEdges(edges: Edge[]): void;
    addEdge(edge: Edge): void;
    removeEdge(edgeId: string): void;
    /**
     * Move all particles by deltaTime.
     * Uses arc-length parameterization: distance += speed * dt, then
     * position = edge.path.getPointAtLength(distance).
     *
     * @param dt         Delta time in seconds (capped by Ticker at 100ms)
     * @param edges      Active (animating) edges this frame
     * @param activeSet  Set of edge IDs that should animate (flow mode filter)
     */
    update(dt: number, edges: Edge[], activeSet: Set<string> | null): void;
    getParticlesForEdge(edgeId: string): Particle[];
    /** Iterate all active particles (avoids building a combined array each frame) */
    forEach(fn: (particles: Particle[], edgeId: string) => void): void;
    clear(): void;
    get poolFreeCount(): number;
}
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