class IOC {
  private readonly items = new Map<Symbol, any>();

  public set<T>(key: Symbol, obj: T): void {
    this.items.set(key, obj);
  }

  public get<T>(key: Symbol): T {
    return this.items.get(key) as T;
  }

  public create<A extends any[], T extends { new(...args: A): T; }>(
    key: Symbol,
    ...args: A
  ): T {
    const cls = this.get(key) as { new(...args: A): T; };
    return new cls(...args);
  }
}

export const ioc = new IOC();