Console log works in function but not out of function with NPM API request

Question

I am currently trying to return an array that is modified within a function. The function is using the "billboard-hot-100" npm.

const { getChart } = require('billboard-top-100');

artistArrayPopular = [];
imageArrayPopular = [];

getChart('artist-100', '', (err, chart) => {
    if (err) console.log(err);
    for (let i = 0; i < 100; i++) {
    artistArrayPopular.push(chart.songs[i].artist)
    imageArrayPopular.push(chart.songs[i].cover)
    }
    console.log("test 1: " + artistArrayPopular);
    return artistArrayPopular;
});
console.log("test 2: " + artistArrayPopular)

The "test 1" console log returns the properly appended array after about a 2 second delay, but the "test 2" not only fires instantly, but also returns a blank array. Plus, the "return" function seems to return a blank array as well.

Can someone troubleshoot this and tell me how to get the appended array to be accessible? I have a feeling it has something to do with asynchronous calls, but I cannot get it to work no matter what I do.