Type utility to transform an object const map into a literal union

type-of-const.ts

/**
 * Transform an object const map into a literal union.
 *
 * @example
 * const Colors = {
 *   Red = "red",
 *   Green = "green",
 *   Blue = "blue",
 * } as const;
 *
 * // "red" | "green" | "blue";
 * type Color = TypeOfConst<typeof Colors>;
 *
 * @see https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#literal-types
 */
export type TypeOfConst<Const> = Const[keyof Const];