index.js

import cheerio from 'cheerio';

const matchers = [
	'.instapaper_title',
	'article h1',
	'.entry-content h1',
	'.markdown-body h1',
	'.entry-title',
	'.post-title',
	'.pageTitle',
	'.post_title',
	'.headline h1',
	'.headline',
	'.story h1',
	'.entry-header h1',
	'.news_title',
	'#page-post h1',
	'.postheader h1',
	'.postheader h2',
	'.type-post h1',
];

const clean = string => string.replace(/\r?\n/g, '').replace(/\s+/g, ' ').trim();

const findSelectorMatch = $ => {
	for (const matcher of matchers) {
		const element = $(matcher).first().text().trim();

		if (element && element.length > 0) {
			return element;
		}
	}
};

export default function articleTitle(html) {
	const $ = cheerio.load(html);

	let documentTitle = $('title').text().replace(/\r?\n/g, '');
	documentTitle = (/^[^|\-/•—]+/.exec(documentTitle) || [])[0] || documentTitle;
	documentTitle = (((documentTitle || '').match(/:(?<documentTitle>.*)/) || []).groups || '').documentTitle || documentTitle;
	documentTitle = (documentTitle || '').trim();

	let title = documentTitle;
	const heading = findSelectorMatch($);

	if (heading && heading.length > 5 && heading.length < 100) {
		title = heading;
	}

	return clean(title);
}