Typescript

Question

我有一个描述带有嵌套函数的对象的类型：

type EntitiesGetters = {
  getCategories: (state: EntitiesState) => (panelID: EntityID) => CategoryGroup;
};

下面是将此类型应用于对象的示例：

export const entitiesGetters: EntitiesGetters = {
  getCategories: (state) => (panelID) => {
    const data = {} as GET_TYPE;

    for (const key in state.categories) {
      const category = state.categories[key];
      if (category.entities.panel === panelID) {
        data[Object.keys(data).length] = category;
      }
    }

    return data;
  },
};

如何在GET_TYPE中获取我需要的类型（对应类型“CategoryGroup”）？

如果我使用了错误的方法，请纠正我。

Answer 1

您应该可以使用内置的 TypeScript ReturnType:

export const entitiesGetters: EntitiesGetters = {
  getCategories: (state) => (panelID) => {
    const data: ReturnType<ReturnType<EntitiesGetters["getCategories"]>> = {}

    // ...

    return data;
  },
};

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