can you import external modules from url? E.g., ```js export default { async fetch (request) {

export default {
    async fetch (request) {
        try {
        const { PurgeCSS } = await import("https://esm.sh/purgecss@4.1.3");
        const [{ css }] = await new PurgeCSS().purge("* { color: #000; }");
            return new Response(css);
        } catch (e) {
            return new Response('oof');
        }
    }
};

export default {
    async fetch (request) {
        try {
        const { PurgeCSS } = await import("https://esm.sh/purgecss@4.1.3");
        const [{ css }] = await new PurgeCSS().purge("* { color: #000; }");
            return new Response(css);
        } catch (e) {
            return new Response('oof');
        }
    }
};