cachedRequest.js

const doSomething = (uniqueThing) => {
  if (doSomething.currentRequest[uniqueThing]) {
    return doSomething.currentRequest[uniqueThing]
  }
  return doSomething.currentRequest[uniqueThing] = require(url, params)
    .then(
      response => {
        delete doSomething.currentRequest
        return response
      },
      error => {
        delete doSomething.currentRequest
        throw error
      }
    )
}

doSomething.cache = {}