Imports are hoisted in es6

imported.es6

import sinon from 'sinon';

let config = require('./path/to/config');
sinon.stub(config, 'get').returns({ port: 1234 });

import * as database from './path/to/database'

//The port is whatever the default is from config.


//What is really going is the above is being intepreted as:

import sinon from 'sinon';
import * as database from './path/to/database'

let config = require('./path/to/config');
sinon.stub(config, 'get').returns({ port: 1234 });

required.es6

import sinon from 'sinon';

let config = require('./path/to/config');
sinon.stub(config, 'get').returns({ port: 1234 });

let database = require('./path/to/database');

//The port is 1234