如何在 TypeScript 中创建循环引用类型? [英] How to create a circularly referenced type in TypeScript?

问题描述

我有以下代码:

type Document = number |字符串 |数组<文档>;

TypeScript 抱怨以下错误:

test.ts(7,6):错误 TS2456:类型别名文档"循环引用自身.

显然不允许循环引用.但是，我仍然需要这种结构.对此有什么解决方法?

解决方案

TypeScript 的创建者解释了如何创建递归类型 此处.

循环引用的解决方法是使用extends Array.在您的情况下，这将导致此解决方案:

type Document = number |字符串 |文档数组；接口 DocumentArray 扩展 Array{ }

更新(TypeScript 3.7)

从 TypeScript 3.7 开始，将允许使用递归类型别名，并且不再需要解决方法.请参阅:https://github.com/microsoft/TypeScript/pull/33050>

I have the following code:

type Document = number | string | Array<Document>;

TypeScript complains with the following error:

test.ts(7,6): error TS2456: Type alias 'Document' circularly references itself.

Clearly circular references are not allowed. However, I still need this kind of structure. What would be a workaround for this?

解决方案

The creator of TypeScript explains how to create recursive types here.

The workaround for the circular reference is to use extends Array. In your case this would lead to this solution:

type Document = number | string | DocumentArray;

interface DocumentArray extends Array<Document> { }

Update (TypeScript 3.7)

Starting with TypeScript 3.7, recursive type aliases will be permitted and the workaround will no longer be needed. See: https://github.com/microsoft/TypeScript/pull/33050

这篇关于如何在 TypeScript 中创建循环引用类型?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！