add enum to javascript

$enum.js

/**
 * @example
 * console.log($enum("A","B","C"),$enum(10)("A","B","C")) // {A:0,B:1,C:2} {A:10,B:11,C:12}
 */
export function $enum(...start){
  const mkobj=(...keys)=>Object.fromEntries(keys.map((x,i)=>[x,typeof start[0] === "number" ? start[0]+i : i]))
  return start.find(x=>typeof x !== "number") ? mkobj(...start) : mkobj
}
export default $enum;