Fetching github users, orgs, and repos and print it.

asyncAwait.js

// @flow
/* global fetch */
/* eslint-disable babel/no-await-in-loop */

type JSONData = null | string | number | boolean | {[key: string]: JSONData} | Array<JSONData>;

function handleResponseJSON(response: Response): Promise<JSONData> {
  return response.json();
}

async function fetchUsers(userNames: Array<string>): Promise<*> {
  console.log('Start fetching');
  console.log('--------------');
  for (let userName of userNames) {
    let orgs = await fetch(`https://api.github.com/users/${userName}/orgs`).then(handleResponseJSON);
    orgs = Array.isArray(orgs) ? orgs : [];
    console.log('Fetching user..');
    let orgsList = new Set();
    for (let org of orgs) {
      let orgName = (org && typeof org === 'object' && typeof org.login === 'string') ? org.login : '';
      orgsList.add(orgName);
      usersOrgs.set(userName, orgsList);
      if (!orgsRepos.has(orgName)) {
        let repos = await fetch(`https://api.github.com/orgs/${orgName}/repos`).then(handleResponseJSON);
        let numRepos = Array.isArray(repos) ? repos.length : 0;
        console.log('Fetching orgs..');
        orgsRepos.set(orgName, numRepos);
      }
    }
  }
  console.log('Fetching done');
  console.log('--------------');
  return 1;
}

async function showUsers(userNames: Array<string>) {
  let result = await fetchUsers(userNames); // eslint-disable-line
  console.log('Start writing');
  console.log('--------------');
  usersOrgs.forEach((orgs: Set<string>, userName: string) => {
    console.log(`${userName} member of ${orgs.size} orgs:`);
    orgs.forEach((orgName: string) => {
      let numRepos = orgsRepos.get(orgName) || 0;
      console.log(`>> ${orgName} has ${numRepos}`);
    });
  });
  console.log('--------------');
  console.log('Writing done.');
}

let userNames = ['mjackson', 'sstur'];
let usersOrgs: Map<string, Set<string>> = new Map();
let orgsRepos: Map<string, number> = new Map();

showUsers(userNames);