githubActions.js

import 'whatwg-fetch'
const GITHUB_API = 'https://api.github.com'

function receiveUser (name, json) {
  return {
    type: 'RECEIVE_USER',
    user: json
  }
}

export function fetchUser ({username}) {
  return (dispatch) => {
    return fetch(`${GITHUB_API}/users/${username}`)
      .then(processResponse)
      .then(json => dispatch(receiveUser(username, json)))
      .catch(error => console.log(error))
  }
}