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<h1>IsRequiredKey <img src="https://img.shields.io/badge/-hard-de3d37" alt="hard"/> <img src="https://img.shields.io/badge/-%23utils-999" alt="#utils"/></h1><blockquote><p>by jiangshan <a href="https://github.com/jiangshanmeta" target="_blank">@jiangshanmeta</a></p></blockquote><p><a href="https://tsch.js.org/2857/play" target="_blank"><img src="https://img.shields.io/badge/-Take%20the%20Challenge-3178c6?logo=typescript&logoColor=white" alt="Take the Challenge"/></a> </p>

Implement a generic ```IsRequiredKey<T, K>```  that return whether ```K``` are required keys of ```T``` .

For example

```typescript
type A = IsRequiredKey<{ a: number, b?: string },'a'> // true
type B = IsRequiredKey<{ a: number, b?: string },'b'> // false
type C = IsRequiredKey<{ a: number, b?: string },'b' | 'a'> // false
```

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一键复制编辑原始数据按行查看历史

提交于 2022-04-19 06:04 . Improve the questions sub-folders names (#8850)

IsRequiredKey

by jiangshan @jiangshanmeta

Implement a generic IsRequiredKey<T, K> that return whether K are required keys of T .

For example

type A = IsRequiredKey<{ a: number, b?: string },'a'> // true
type B = IsRequiredKey<{ a: number, b?: string },'b'> // false
type C = IsRequiredKey<{ a: number, b?: string },'b' | 'a'> // false