export default class DblKeyMap<Key, SubKey, Value> {
    private map;
    get(key: Key): Map<SubKey, Value> | undefined;
    get(key: Key, subKey: SubKey): Value;
    set(key: Key, subKey: SubKey, value: Value): void;
    forEach(cb: (value: Value, key: Key, subKey: SubKey) => void): void;
    delete(key: Key): void;
    deleteAll(): void;
}