TypeScript为“ as X”定义接口

Question

我有以下代码：

const [surveyResponses, totalCount]: [SurveyResponse[], number] =
await this.someRepo.findByFilters(filter) as [SurveyResponse[], number];

是否可以给as [SurveyResponse[], number]部分提供接口？ findByFilters函数是否返回分页结果，所以我想为每个接口都有一个接口。

Answer 1

不是接口，而是类型别名，是的：

type X = [SurveyResponse[], number];

const [surveyResponses, totalCount]: X = ...
await this.someRepo.findByFilters(filter) as X;