declare const REFERENCE_KEY: unique symbol;
export interface Reference {
    [REFERENCE_KEY]: true;
}
export declare function asRef<T extends {} | undefined>(obj: T): T extends undefined ? undefined : T & Reference;
export declare function isRef(obj: any): obj is Reference;
export declare class ReferenceMap {
    private refs;
    private refsById;
    private refCount;
    has(obj: Reference): boolean;
    get(obj: Reference): number | undefined;
    getByRefId(refId: number): Reference | undefined;
    create(obj: Reference): number;
    clear(): void;
    deleteByRefId(refId: number): void;
    set(ref: Reference, refId: number): void;
    snapshot(): number;
    get size(): number;
    rollbackTo(savedRefCount: number): void;
}
export {};
//# sourceMappingURL=reference.d.ts.map