import type { EntityManagerSnapshot } from "./Serialization.js";
export type EntityId = number & {
    readonly __brand: "EntityId";
};
export declare function pack(index: number, gen: number): EntityId;
export declare function getIndex(id: EntityId): number;
export declare function getGen(id: EntityId): number;
export declare class EntityManager {
    private nextIndex;
    private freeList;
    private activeEntities;
    private activeEntitiesCache;
    createEntity(): EntityId;
    destroyEntity(entityId: EntityId): boolean;
    isEntityValid(entityId: EntityId): boolean;
    getEntityCount(): number;
    getAllActiveEntities(): readonly EntityId[];
    serialize(): EntityManagerSnapshot;
    deserialize(snapshot: EntityManagerSnapshot): void;
}
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