README - Type Challenges

<h1>Append Argument </h1><blockquote><p>by Maciej Sikora <a href="https://github.com/maciejsikora" target="_blank">@maciejsikora</a></p></blockquote><p><a href="https://tsch.js.org/191/play" target="_blank"></a>    <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>

For given function type Fn, and any type A (any in this context means we don't restrict the type, and I don't have in mind any type 😉) create a generic type which will take Fn as the first argument, A as the second, and will produce function type G which will be the same as Fn but with appended argument A as a last one.

For example,

typescript

type Fn = (a: number, b: string) => number

type Result = AppendArgument<Fn, boolean> 
// expected be (a: number, b: string, x: boolean) => number

This question is ported from the original article by @maciejsikora