A complete HEX string type using Template Literal Types

hex.d.ts

// https://www.typescriptlang.org/docs/handbook/2/template-literal-types.html

type THexBase = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9";
type THexLower = "a" | "b" | "c" | "d" | "e" | "f";
type THexUpper = "A" | "B" | "C" | "D" | "E" | "F";

/**
 * Includes 1 & 2 character hex strings.
 *
 * @example "0", "00", ..., "f", "ff", ..., "F", "FF"
 */
type THexStr =
  | `${THexBase}${THexBase}`
  | `${THexBase}${THexLower}`
  | `${THexLower}${THexBase}`
  | `${THexBase}${THexUpper}`
  | `${THexUpper}${THexBase}`
  | `${THexLower}${THexLower}`
  | `${THexLower}${THexUpper}`
  | `${THexUpper}${THexLower}`
  | `${THexUpper}${THexUpper}`
  | THexBase
  | THexLower
  | THexUpper;