cached-json-fetch.js

// @flow
import cache from 'memory-cache'
import fetch from 'isomorphic-fetch'

const TTL_MILISECONDS: number = 10 * 60 * 1000 // ten minutes

export default async function<T>(url: string, options?: Object): Promise<T> {
	const cachedResponse = cache.get(url)
	if (cachedResponse) return cachedResponse

	// If there is no cached response,
	// do the actual call and store the response
	return fetch(url, options)
		.then(response => response.json())
		.then(response => {
			cache.put(url, response, TTL_MILISECONDS)
			return response
		})
}