svelte/sites/svelte.dev/src/routes/+layout.server.js

export const load = async ({ url, fetch }) => {
	const nav_list = await fetch('/nav.json').then((r) => r.json());

	return {
		nav_title: get_nav_title(url),
		nav_links: nav_list
	};
};

/** @param {URL} url */
function get_nav_title(url) {
	const list = new Map([
		[/^docs/, 'Docs'],
		[/^repl/, 'REPL'],
		[/^blog/, 'Blog'],
		[/^faq/, 'FAQ'],
		[/^tutorial/, 'Tutorial'],
		[/^search/, 'Search'],
		[/^examples/, 'Examples']
	]);

	for (const [regex, title] of list) {
		if (regex.test(url.pathname.replace(/^\/(.+)/, '$1'))) {
			return title;
		}
	}

	return '';
}