import { Entity } from './entity.js';
export interface EntityPoolSnapshot {
    readonly capacity: number;
    readonly activeOrder: readonly number[];
    readonly freeList: readonly number[];
    readonly pendingFree: readonly number[];
}
export declare class EntityPool implements Iterable<Entity> {
    private readonly entities;
    private readonly freeList;
    private readonly pendingFree;
    private activeHead;
    constructor(maxEntities?: number);
    get world(): Entity;
    get capacity(): number;
    get activeCount(): number;
    getByIndex(index: number): Entity | undefined;
    [Symbol.iterator](): Iterator<Entity>;
    spawn(): Entity;
    deferFree(entity: Entity): void;
    freeImmediate(entity: Entity): void;
    flushFreeList(): void;
    createSnapshot(): EntityPoolSnapshot;
    restore(snapshot: EntityPoolSnapshot): void;
    private link;
    private unlink;
}
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