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// Copyright 2019-2020 Yusuke Sakurai. All rights reserved. MIT license.type Key = string | symbol;export interface DataHolder {  set<T = unknown>(key: Key, value: T): void;  get<T = unknown>(key: Key): T | undefined;  getString(key: Key): string | undefined;  getNumber(key: Key): number | undefined;  getBoolean(key: Key): boolean | undefined;  delete(key: Key): void;}
export function createDataHolder(): DataHolder {  const data = new Map<Key, any>();  function _set<T>(k: Key, v: T) {    data.set(k, v);  }  function _get<T>(k: Key): T | undefined {    return data.get(k) as T;  }  function _delete(k: Key) {    data.delete(k);  }  function getString(k: Key): string | undefined {    return _get<string>(k);  }  function getNumber(k: Key): number | undefined {    return _get<number>(k);  }  function getBoolean(k: Key): boolean | undefined {    return _get<boolean>(k);  }  return {    set: _set,    get: _get,    delete: _delete,    getNumber,    getString,    getBoolean,  };}