index.js

import ky from 'ky';
import {load as cheerioLoad} from 'cheerio';
import npmEmail from 'npm-email';

export default async function npmUser(username) {
	if (typeof username !== 'string') {
		throw new TypeError('Username required');
	}

	const url = `https://www.npmjs.com/~${username}`;
	try {
		const [profile, email] = await Promise.all([ky(url).text(), npmEmail(username)]);
		const $ = cheerioLoad(profile);

		let avatar = $('img[src^="/npm-avatar"]')?.attr('src') || undefined;
		avatar &&= `https://www.npmjs.com${avatar}`;

		const $sidebar = $('[class^="_73a8e6f0"]');

		return {
			name: $sidebar.find('.eaac77a6.mv2').text() || undefined,
			avatar,
			email,
			github: $sidebar.find('a[href^="https://github.com/"]').text().slice(1) || undefined,
			twitter: $sidebar.find('a[href^="https://twitter.com/"]').text().slice(1) || undefined,
		};
	} catch (error) {
		if (error?.response?.status === 404) {
			const notFoundError = new Error(`User \`${username}\` could not be found`, {cause: error});
			notFoundError.code = 'ERR_NO_NPM_USER';
			throw notFoundError;
		}

		throw error;
	}
}