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<!--info-header-start--><h1>String to Union </h1><blockquote><p>by Andrey Krasovsky <a href="https://github.com/bre30kra69cs" target="_blank">@bre30kra69cs</a></p></blockquote><p><a href="https://tsch.js.org/531/play/zh-CN" target="_blank"></a> &nbsp;&nbsp;&nbsp;<a href="./README.md" target="_blank"></a> <a href="./README.ja.md" target="_blank"></a> <a href="./README.ko.md" target="_blank"></a> </p><!--info-header-end-->

实现一个将接收到的String参数转换为一个字母Union的类型。

例如

ts
type Test = '123';
type Result = StringToUnion<Test>; // expected to be "1" | "2" | "3"
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