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What would be the preferred way to create constants in javascript, specifically with ES6?

Currently I have a constants class which has methods that return the string I'm looking for.

 class Constants {
    constructor() {}

    SOMECONSTANT() {
       return 'someconstant';
    }
 }
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For backwards compatibility, I would create a read-only property of the encapsulating object, which could be the global object:

Object.defineProperty(this, 'CONST', {
  value: 123,
  writable: false
});

See: Object.defineProperty - writable attribute

Otherwise, ES6 has a const keyword.

const name1 = value1 [, name2 = value2 [, ... [, nameN = valueN]]];

See const.

  • My understanding with the const keyword is that it can only be used in local scope. I should have clarified I need the constants scoped globally. – Beanwah May 28 '15 at 21:26
  • Local or global. It's block scoped, I think. – svidgen May 29 '15 at 0:44

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