export declare class IdMap {
    private _map;
    private _idStringify;
    private _idParse;
    constructor(idStringify?: (obj: any) => string, idParse?: (str: string) => any);
    get(id: any): any;
    set(id: any, value: any): void;
    remove(id: any): void;
    has(id: any): boolean;
    empty(): boolean;
    clear(): void;
    forEach(iterator: (doc: any, key: string) => any): void;
    size(): number;
    setDefault(id: any, def: any): any;
    clone(): IdMap;
}