export declare function ensureSetInMap<K, T>(map: Map<K, Set<T>>, mapKey: K): Set<T>;
export declare function ensureMapInMap<K, T extends Map<any, any>>(map: Map<K, T>, mapKey: K): T;
export declare function ensureArrayInMap<K, T>(map: Map<K, T[]>, mapKey: K): T[];