memoized_function_wrapper

// This Gist doesn't work with Graphql because of the deep nature of "selections" object

import { get } from 'lodash'
const memoizedResults = {}

export default (serializer: string, fn: Function): Function => async (
  ...args: Array<any>
): Promise<Object> => {
  const [serializable, selections] = args
  const identifier = get(serializable, 'id', get(serializable, 'uid'))
  const memoized = get(memoizedResults, `${serializer}.${identifier}`)
  const existingSelection = get(memoizedResults, `${serializer}.${identifier}.selections`, [])
  const hasSelection = selections === existingSelection
  if (memoized && hasSelection) {
    return get(memoizedResults, `${identifier}.data`)
  }
  const data = await fn(...args)
  memoizedResults[serializer] = {
    ...memoizedResults[serializer],
    [identifier]: {
      data,
      selections,
    },
  }
  return data
}