optimize.js

var syncDep;

function getLottery() {
  return new Promise((resolve, reject) =>{
     if (syncDep === undefined) { //check of we already have this data...if not THEN go get
          setTimeout(function() {
            syncDep = [1,22,34,56,5];
            resolve(syncDep);
        }, 2000); 
     } else {
         console.log('syncSet');
         resolve(syncDep);
     }
  });
}

exports.handler = function(context, event, callback) {
    getLottery().then(numbers =>{
        callback(null,numbers);
    });
}