node: creating an object of constants and extending it

status_type.js

"use strict";

var status, status_type;

status = {
  OFFLINE: 0,
  ONLINE: 1
};

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze
status_type = Object.freeze(status);

export.status_type = status_type;

status_type_intermetent.js

var _, status_type, status_type_intermetent;

_ = require('lodash'); // only for help pourpose
status_type = require('./status_type');

// status_type = { OFFLINE: 0, ONLINE: 1, CONNECTING: 2 }
status_type_intermetent = Object.freeze(
  _.extend(
    _.clone(status_type),
    { CONNECTING: 2 }
  )
);

export.status_type_intermetent = status_type_intermetent;