This solution is generated by ChatGPT, correctness is not guaranteed. You might also be able to find a solution fromcommunity posts.

# AI solution for TypeScript puzzle on BFE.dev 34. implement Repeat<T, C>

Here's one possible solution using recursion and conditional types:

``type Repeat<T, C extends number> = C extends 0 ? [] : [T, ...Repeat<T, C-1>];``

Explanation:

• `T` is the type to repeat.
• `C` is the number of times to repeat it. We use a conditional type to detect the special case of `C` being zero, which means the result should be an empty tuple.
• We define `Repeat` to be a tuple: the first element is always of type `T`, and the rest is obtained by recursively calling `Repeat` with `T` and `C-1`.
• The `...` syntax is used to spread the result of the recursive call, so that it becomes part of the tuple.

Let's test it with the examples from the prompt:

``type A = Repeat<number, 3>; // [number, number, number]type B = Repeat<string, 2>; // [string, string]type C = Repeat<1, 1>; // [1, 1]type D = Repeat<0, 0>; // []``

All of them are type-checked correctly by TypeScript. Note that `C` being negative is not a valid input according to the prompt, so the behavior in that case is not specified. This implementation assumes that negative numbers are simply treated as zero.