AWS style callbacks with await syntax

// const a = _ => new Promise((resolve, reject) => resolve(2));
// const b = x =>  new Promise((resolve, reject) => resolve(x+10));

// a().then(m => b(m).then(z => console.log(z)));


async function fn() {
  const a = await promiseWrapper(fakeNetworkFn, 10);
  const b = await promiseWrapper(fakeNetworkFn, a);
  
  return b;
}

const fakeNetworkFn = (params, lcb) => {
  const data = 5 + params;
  setTimeout(() => lcb(_, data), 300);
}

const promiseWrapper = (fn, params, cb) => new Promise((resolve, reject) => fn(params, (err, data) => resolve(data)))

fn().then(e => console.log(e))