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<!--info-header-start--><h1>Permutation </h1><blockquote><p>by Naoto Ikuno <a href="https://github.com/pandanoir" target="_blank">@pandanoir</a></p></blockquote><p><a href="https://tsch.js.org/296/play" target="_blank"></a> &nbsp;&nbsp;&nbsp;<a href="./README.zh-CN.md" target="_blank"></a> <a href="./README.ja.md" target="_blank"></a> <a href="./README.ko.md" target="_blank"></a> </p><!--info-header-end-->

Implement permutation type that transforms union types into the array that includes permutations of unions.

typescript
type perm = Permutation<'A' | 'B' | 'C'>; // ['A', 'B', 'C'] | ['A', 'C', 'B'] | ['B', 'A', 'C'] | ['B', 'C', 'A'] | ['C', 'A', 'B'] | ['C', 'B', 'A']
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