Why doesn't the outer variable change?

Question

Node.js

const scra = require('scra');

function main(message) {
    var rating;
    var getRating = (data) => {
        rating = data;
    }
    scra('тут сайт, данные которого я успешно получаю', (err, res) => {
        if(err) console.error(err.message);
        if(res) rating = JSON.parse(res.body);
        getRating(rating);
    });
    console.log(rating);
}

main("fff");

ratingHow can I assign the received value to an external variable in scra? I tried to change directly, but a new local variable is created and the callback function is used