Question

在Typescript中，我想利用我的字符串枚举：

export const enum MutationKeys {
    registerUser = 'registration/REGISTER',
    registerUserCompleted = 'registration/REGISTER_COMPLETED'
}

这样它的字符串值就像这样对象提供了类型检查约束：

const mutations: IDictionary<VuexMutation> = {
    ['registration/REGISTER'](state, payload) {
        state.registration = {
            meta: {
                serverValidated: false
            },
            value: payload
        };
    },
    ['registration/REGISTER_COMPLETED'](state) {
        state.registration.meta.serverValidated = true;
    }
};

在上面的示例中，IDictionary<VueMutation>接口允许我键入对象vlue的值，但允许任何字符串索引。

Answer 1

您可以使用key in construct：

export const enum MutationKeys {
  registerUser = 'registration/REGISTER',
  registerUserCompleted = 'registration/REGISTER_COMPLETED'
}

type MutationDictionnary<P> = {
  [key in MutationKeys]: P
}

const mutations: MutationDictionnary<VuexMutation> = {
  ['registration/REGISTER'](state, payload) {
    state.registration = {
      meta: {
        serverValidated: false
      },
      value: payload
    };
  },
  ['registration/REGISTER_COMPLETED'](state) {
    state.registration.meta.serverValidated = true;
  }
};

使用String Enum为接口提供索引

1 个答案: