Get dependencies using await

deps-await-part1.js

const fetch = require('node-fetch');

async function getDependencies(packageName) {
    const url = `https://registry.npmjs.org/${packageName}/latest`;
    try {
        const response = await fetch(url);
        const body = await response.json();
        return Array.from(Object.keys(body.dependencies));
    } catch (err) {
        return [];
    }
}

function getAllDependencies(packageName) {
    return getDependencies(packageName).then(deps => {
        return Promise.all(deps.map(dep => {
            return getAllDependencies(dep).then(subDepValues => {
                return [...subDepValues, ...deps];
            });
        })).then(values => {
            return [...new Set([].concat(...values))];
        });
    });
}

getAllDependencies('forever').then(values => {
    console.log(values);
});