How can I guarantee that my enums definition doesn’t change in JavaScript?

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Would the following make the objects fulfil all characteristics that enums have in JavaScript? Something like:

my.namespace.ColorEnum = {
  RED : 0,
  GREEN : 1,
  BLUE : 2
}

// later on

if(currentColor == my.namespace.ColorEnum.RED) {
  // whatever
}

Or is there some other way I can do this?

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