<!--info-header-start--><h1>Tuple to Union <img src="https://img.shields.io/badge/-medium-d9901a" alt="medium"/> <img src="https://img.shields.io/badge/-%23infer-999" alt="#infer"/> <img src="https://img.shields.io/badge/-%23tuple-999" alt="#tuple"/> <img src="https://img.shields.io/badge/-%23union-999" alt="#union"/></h1><blockquote><p>by Anthony Fu <a href="https://github.com/antfu" target="_blank">@antfu</a></p></blockquote><p><a href="https://tsch.js.org/10/play" target="_blank"><img src="https://img.shields.io/badge/-Take%20the%20Challenge-3178c6?logo=typescript&logoColor=white" alt="Take the Challenge"/></a> &nbsp;&nbsp;&nbsp;<a href="./README.zh-CN.md" target="_blank"><img src="https://img.shields.io/badge/-%E7%AE%80%E4%BD%93%E4%B8%AD%E6%96%87-gray" alt="简体中文"/></a>  <a href="./README.ja.md" target="_blank"><img src="https://img.shields.io/badge/-%E6%97%A5%E6%9C%AC%E8%AA%9E-gray" alt="日本語"/></a>  <a href="./README.ko.md" target="_blank"><img src="https://img.shields.io/badge/-%ED%95%9C%EA%B5%AD%EC%96%B4-gray" alt="한국어"/></a>  <a href="./README.pt-BR.md" target="_blank"><img src="https://img.shields.io/badge/-Portugu%C3%AAs%20(BR)-gray" alt="Português (BR)"/></a> </p><!--info-header-end-->

Implement a generic `TupleToUnion<T>` which covers the values of a tuple to its values union.

For example

```ts
type Arr = ['1', '2', '3']

type Test = TupleToUnion<Arr> // expected to be '1' | '2' | '3'
```

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