all about node async await asynchronous and synchronous functions

function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

async function addprop(obj) {
        await sleep(2000);
        obj.deps = {};
}

var tree={};

addprop(tree);
console.log(tree);
addprop(tree.deps);
console.log(tree);
addprop(tree.deps.deps);
console.log(tree);