/**
 * map of value or map, aka nested map
 *
 * example use cases:
 *   - memorized function parameter lookup
 *
 * K can be any type
 * */
export declare class MapMap<K, V> {
    private m;
    constructor();
    has(k: K): boolean;
    get(k: K): V | undefined;
    set(k: K, v: V): Map<K, V>;
    /**
     * @returns true if an element in the Map existed and has been removed, or false if the element does not exist.
     */
    delete(k: K): boolean;
    getMap(k: K): (V | undefined) & MapMap<any, any>;
    clear(): void;
}
/**
 * Key can only be number, string or symbol
 * */
export declare class SimpleMapMap<K extends PropertyKey, V> {
    private o;
    has(k: K): boolean;
    get(k: K): V | undefined;
    set(k: K, v: V): void;
    getMap(k: K): (V | undefined) & SimpleMapMap<any, any>;
    clear(): void;
}