Practicing promises and yargs.

getUserGitHubRepos.js

// usage: node index.js getUserRepos --username  userName

const fetch = require("node-fetch");
const yargs = require("yargs");
const path = require("path");

yargs.command({
	command: "getUserRepos",
	builder: {
		username: {
			describe: "username",
			demandOption: true,
			type: "string",
		},
	},
	handler(argv) {
		console.log(argv.username);
		displayUserRepos(argv.username);
	},
});

yargs.parse();

function displayUserRepos(username) {
	fetch(`https://api.github.com/users/${username}/repos`)
		.then((res) => {
			if (res.status == 404) {
				throw Error("Can't get data");
			}
			res.json();
		})
		.then((json) => {
			json.forEach((element) => {
				let repoName = path.basename(element.html_url);
				console.log(repoName);
			});
		})
		.catch((error) => console.log(error));
}