如何從Typescript中的構造函數（鍵）和類實例（值）聲明Map？

Question

以下代碼具有component.constructor（實體構造函數以及addComponent和removeComponent方法）錯誤。

錯誤：不能將類型為“功能”的參數分配給類型為“ typeof Component”的參數。

如何聲明Map，其中key =類構造函數，值=類實例？

declare class Component {
  constructor(...argArray: any[]);
}

// declare type MapOfComponents = Map<{new(): Component}, Component>
declare type MapOfComponents = Map<typeof Component, Component>

export default class Entity {
  static id = 1;

  id: number;
  components: MapOfComponents = new Map();

  constructor(components?: Array<Object>) {
    this.id = Entity.id++;

    components.forEach((component) => {
      this.components.set(component.constructor, component);
    });
  }

  addComponent(component: Component): this {
    this.components.set(component.constructor, component);
    return this;
  }

  removeComponent(component: Component): this {
    this.components.delete(component.constructor);
    return this;
  }

  hasComponent(ctr: typeof Component): boolean {
    return !!this.components.get(ctr);
  }

  getComponent(ctr: typeof Component): Object {
    return this.components.get(ctr);
  }
}

Answer 1

構造函數是一個函數，因此您可以編寫：

declare type MapOfComponents = Map<Function, Component>