nopeless

// Prime checking regex, which this code is based off of
// https://regex101.com/r/RIJkGF/1

type StringDivisible<n extends string, div extends string> = n extends `` ? true : n extends `${div}${infer r}` ? StringDivisible<r, div> : false;

type Substrings<n extends string, d extends string = ""> = n extends `${d}${infer r}` ? readonly [` ${d}`, ...Substrings<r, ` ${d}`>] : readonly [];
type StringFactors<n extends string> = Substrings<n> extends readonly [unknown, ...infer R extends readonly string[], unknown] ? R : never;
type StringIsPrime<n extends string, Factors extends readonly string[] = StringFactors<n>> = Factors extends readonly [infer s extends string, ...infer R extends readonly string[]] ? StringDivisible<n, s> extends true ? false : StringIsPrime<n, R> : true;

type RepeatStringByStringDigit<str extends string, d extends string> =