http_client_with_fetch.js

const METHODS = ['get', 'post'];

export const createHTTPClient = baseURL => METHODS.reduce((acc, cur) => ({
  ...acc,
  [cur]: async (path, options) => {
    const res = await window.fetch(`${baseURL}${path}`, { method: cur.toLowerCase(), ...options });
    const json = await res.json();
    return json;
  },
}), {});