Node.js TypeScript: 声明自定义数据类型

huangapple
go评论107阅读模式
英文:

Nodejs typescript: declarer custom data type

问题

只更改每个的数据类型：

  1. data: { x: 1 } as anotherTypeX
  2. data: { y: 1 } as anotherTypeY
英文:

I have multiple services and all of them return same result:

  1. type result = {
  2.   success: boolean
  3.   data?: any
  4. }
  6. const a = async (): Promise<result> => {
  7.   ...
  8. }
  10. const b = async (): Promise<result> => {
  11.   ...
  12. }

But data of a is different of b:

  1. const a = async (): Promise<result> => {
  2.   return {
  3.     success: true,
  4.     data: { x: 1 }
  5.   }
  6. }
  8. const b = async (): Promise<result> => {
  9.   return {
  10.     success: true,
  11.     data: { y: 1 }
  12.   }
  13. }

And I want to change only data type for each one

  1. data: { x: 1 } as anotherTypeX
  2. data: { x: 1 } as anotherTypeY

答案1

得分: 0

使用泛型将为您解决这个问题，并为您提供适当的类型支持。

查看文档这里

  1. type result<T> = {
  2.   success: boolean;
  3.   data?: T;
  4. }
  6. type A = {
  7.    x: number;
  8. }
  9. type B = {
  10.    y: number;
  11. }
  13. const a = async (): Promise<result<A>> => {
  14.   return {
  15.     success: true,
  16.     data: { x: 1 }
  17.   }
  18. }
  20. const b = async (): Promise<result<B>> => {
  21.   return {
  22.     success: true,
  23.     data: { y: 1 }
  24.   }
  25. }
英文:

The use of generics will solve this issue for you and you will have proper typing support.

See docs here

  1. type result&lt;T&gt; = {
  2.   success: boolean;
  3.   data?: T;
  4. }
  6. type A = {
  7.    x: number;
  8. }
  9. type B = {
  10.    y: number;
  11. }
  13. const a = async (): Promise&lt;result&lt;A&gt;&gt; =&gt; {
  14.   return {
  15.     success: true,
  16.     data: { x: 1 }
  17.   }
  18. }
  20. const b = async (): Promise&lt;result&lt;B&gt;&gt; =&gt; {
  21.   return {
  22.     success: true,
  23.     data: { y: 1 }
  24.   }
  25. }

huangapple
  • 本文由 发表于 2023年4月4日 16:59:12
  • 转载请务必保留本文链接：https://go.coder-hub.com/75927404.html
  • javascript
  • node.js
  • typescript
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