import { Maybe } from '../../monads/maybe';
import { Hashable } from '../../objects/hash';
import { Equalable } from '../../objects/equals';
/**
 * A Map:
 *  Is a lookup table with constant access behavior.
 *  In the case of a HashMap or HashTable,
 *  this is achieved by storing the value key pairs in arrays as "buckets"
 *  using their hash values
 *  (a good hashing function will distribute the keys evenly)
 *
 *
 * @startuml
 * title VNMap
 * interface VNMap<Key, Value> {
 *   size(): Int
 *   get(key: Key): Maybe<Value>
 *   set(key: Key, value: Value): Unit
 *   unset(key: Key): Unit
 *   toString(): string
 * }
 * @enduml
 */
export interface VNMap<Key extends Hashable & Equalable, Value> {
    get(key: Key): Maybe<Value>;
    set(key: Key, value: Value): void;
    map<NewKey extends Hashable & Equalable, NewValue>(mapper: (pair: [Key, Value]) => [NewKey, NewValue]): VNMap<NewKey, NewValue>;
    iter(): [Key, Value][];
    unset(key: Key): void;
    size(): number;
    toString(): string;
}
export declare function createHashTable<Key extends Hashable & Equalable, Value>(): VNMap<Key, Value>;