Simple function to create an enumeration (sort of), in which the key and the value match.

createEnumaration.js

'use strict';

const createEnumeration = (...keys) =>
  keys.reduce(
    (result, key) => Object.assign(result, { [key]: key }),
    {}
  );
  
const myEnum = createEnumeration(
  'first',
  'second',
  'third'
);

console.log(myEnum);

https://stackblitz.com/edit/js-kngxa2