如何在redux-toolkit中键入providEtags（许多项目端点）

Question

以下代码运行良好，但是我不设法键入providestags正确：

type Post = {
  id: number,
  name: string,
  description: string,
}

const postsApiSlice = api.injectEndpoints({
    endpoints: (builder) => ({
      getPosts: builder.query<EntityState<Post>, void>({
        query: ROUTES.POSTS,
        transformResponse: (responseData: Post[]) => {
          return adapter.setAll(initialState, responseData)
        },
        // Typescript error is here, at provideTags
        providesTags: (result) => {
          // What to do if result is undefined?
          if (!result) return [{ type: POST_TAG, id: 'LIST' }]
  
          const tags = (result.ids.length > 0) ?
            // Typescript accepts type of next line if I return it
            result.ids.map((id) => ({ type: POST_TAG, id }))
            :
            // Typescript also accepts type of next line if I return it
            [{ type: POST_TAG, id: 'LIST' }]
          return tags
        }
      }),
    }),
  })

typescript错误我得到：

Type '(result: EntityState<Post> | undefined) => { type: string; id: EntityId; }[]' is not assignable to type 'ResultDescription<"Post", EntityState<Post>, void, FetchBaseQueryError, {} | undefined> | undefined'.
  Type '(result: EntityState<Post> | undefined) => { type: string; id: EntityId; }[]' is not assignable to type 'GetResultDescriptionFn<"Post", EntityState<Post>, void, FetchBaseQueryError, {} | undefined>'.
    Type '{ type: string; id: EntityId; }[]' is not assignable to type 'readonly TagDescription<"Post">[]'.
      Type '{ type: string; id: EntityId; }' is not assignable to type 'TagDescription<"Post">'.
        Type '{ type: string; id: EntityId; }' is not assignable to type 'FullTagDescription<"Post">'.
          Types of property 'type' are incompatible.
            Type 'string' is not assignable to type '"Post"'.ts(2322)
endpointDefinitions.d.ts(188, 5): The expected type comes from property 'providesTags' which is declared here on type 'Omit<EndpointDefinitionWithQuery<void, BaseQueryFn<string | FetchArgs, unknown, FetchBaseQueryError, {}, {}>, EntityState<Post>> & { ...; } & { ...; } & QueryExtraOptions<...>, "type"> | Omit<...>'

如果我返回result.ids.map（（id）=＆gt;（{type：post_tag） ，id}）））或仅[{type：post_tag，id：'list'}]正常工作。

• 我该如何输入？
• 另外，不确定结果是未定义时该怎么办。我应该返回[{type：post_tag，id：'list'}]？

Answer 1

这在

当您定义post_tag时，您将需要一些作为const断言。

因此，不是const post_tag =“ foo”，而是const post_tag =“ foo”，因为const应该可以解决问题。否则，它将被键入“字符串”，而不是“ foo”。