Promises and timers

faketimeout.js

const TIMEOUT = 5000;

const promiseTimeout = delay => new Promise( ( resolve, reject ) =>  setTimeout( () => reject( new Error('fake timeout') ), delay ) );


const doSomethingAsync =  ( ) => {
  return Promise.resolve()
    .then( () => promiseTimeout( TIMEOUT ) );
}; 

// logs 'TimeoutError'