neverUsedGithub

type StringToArray<str extends string> = str extends `${infer First}${infer Rest}`
    ? [ First, ...StringToArray<Rest> ]
    : []

type NewArray<length extends number, arr extends any[] = []> = arr["length"] extends length
    ? arr
    : NewArray<length, [ ...arr, any ]>;

type New2DArray<length extends number, arr extends any[][] = []> = arr["length"] extends length
    ? arr

neverUsedGithub

// Utility
type GetFirstCharacter<Text extends string> = Text extends `${infer First}${infer Rest}` ? First : never;
type StringStartsWith<Source extends string, Char extends string> = Source extends `${infer First}${infer Rest}`
  ? First extends Char
    ? true
    : false
  : false;
type SliceStringFirst<Source extends string> = Source extends `${infer First}${infer Rest}`
  ? Rest
  : never;