Node modules

import url from 'url';
import moment from 'moment';

Meteor packages

import { Meteor } from 'meteor/meteor';
import { SimpleSchema } from 'meteor/aldeed:simple-schema';

In package.js:

Npm.depends({
  moment: "2.8.3"
});

In a package file:

import moment from 'moment';

// Default export
export default {};

// Named export
export const SomeVariable = {};

In your mainModule file:

export const SomeVar = {};