import.js

var api = foo
api.foo = 1
api.bar = 2
export default api

Object.assign(foo, someThings)
export default foo

array.forEach(item => {
  bar[item.key] = item.value
})
export default bar

import foo from './foo'
foo.applyTo(thing)
export default thing

require.js

var api = exports
api.foo = 1
api.bar = 2

Object.assign(exports, someThings)

array.forEach(item => {
  exports[item.key] = item.value
})

require('./foo').applyTo(exports)