Cloudflare Pages Functions TypeScript

// functions/pixel.gif.ts  (the file path is the route)
const GIF = Uint8Array.from(atob('R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw=='), (c) => c.charCodeAt(0));

export const onRequestGet: PagesFunction = () =>
  new Response(GIF, {
    headers: { 'Content-Type': 'image/gif', 'Cache-Control': 'no-store' },
  });