async.js

const service = {
  getUsers: () => fetch(`https://jsonplaceholder.typicode.com/users`),
  getGroups: () => fetch(`https://jsonplaceholder.typicode.com/posts`)
};

async function getData() {
  try {
    const peoplePromise = await service.getUsers();
    const groupsPromise = await service.getGroups();
    
    const people = await peoplePromise.json();
    const groups = await groupsPromise.json();
    
    const data = { people, groups }
    
    //or you can return data out of function
    console.log(`result data`, data)
    
  } catch(err) {
    console.error(err)
  }
}

getData();