export class KeyValue<K, V> extends Array {
  /**
   * Creates an instance of `KeyValue`.
   *
   * @param {K} [key]
   * @param {V} [value]
   * @memberof KeyValue
   */
  constructor(key?: K, value?: V) {
    super();
    this[0] = key;
    this[1] = value;
  }

  /**
   * Gets the key of this `KeyValue` pair.
   *
   * @readonly
   * @type {K}
   * @memberof KeyValue
   * @wIgnore
   */
  // eslint-disable-next-line @typescript-eslint/naming-convention
  get Key(): K {
    return this[0];
  }

  /**
   * Gets the value of this `KeyValue` pair.
   *
   * @readonly
   * @type {V}
   * @memberof KeyValue
   * @wIgnore
   */
  // eslint-disable-next-line @typescript-eslint/naming-convention
  get Value(): V {
    return this[1];
  }

  /**
   * Returns a new instance of `KeyValue`, ready to be used as a regular array.
   *
   * @static
   * @template TKey
   * @template TValue
   * @param {TKey} [key]
   * @param {TValue} [value]
   * @return {*}  {[TKey, TValue]}
   * @memberof KeyValue
   */
  static pair<TKey, TValue>(key?: TKey, value?: TValue): [TKey, TValue] {
    return new KeyValue(key, value) as any;
  }
}