Global object difference between Browser and Node

output.md

Output in Browser:

undefined
undefined
{test: "abcd"}
"abcd"

Output in Node:

undefined
undefined
prepareTest { test: 'abcd' }
undefined

test.js

function prepareTest() {
  this.test = "abcd";
}

// global
console.log(this.test);

const a = prepareTest();
const b = new prepareTest()

console.log(a);
console.log(b);

// global
console.log(this.test);