dynamic-import.js

// https://github.com/tc39/proposal-dynamic-import
// http://2ality.com/2017/01/import-operator.html#loading-code-on-demand

/**
 CURRENT STATE
 - top-level, not conditional, not able to be used in event handler, 
 - not dynamic due, fixed module specifier (./dir/someModule)
 **/
import * as someModule from './dir/someModule.js'


/**
 PROPOSAL
 - parameter can be any expression whose result can be coerced to a string (runtime-determined template strings)
 - function style, returns a promise
 - promise resolves after fetching, instantiating, and evaluating all of the module's dependencies & module itself
 - works for both scripts and modules
 - stage 3/candidate of tc39 process
 **/
const moduleSpecifier = './dir/someModule.js'

import(moduleSpecifier)
  .then(someModule => someModule.foo())