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feat(landing): DataFast analytics, goals, Polar attribution, crawler tracking - #24
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- Cookieless DataFast build injected after the load event, served
first-party through vercel.json rewrites (/js/script.cookieless.js,
/api/events). A head queue stub keeps goals fired before it loads.
Cookieless because the landing has no consent banner.
- Goals: download_dmg and github_click via data-fast-goal with location;
scroll_pricing and scroll_faq scroll goals; license_key_copied on the
success page. buy_pro_click is sent by a click handler that holds a plain
click for 250ms before following /buy, because DataFast posts goals with
an XHR the browser cancels when the page navigates to checkout.
- Revenue attribution: the success page carries the tag, which reads the
Polar checkout_id and reports a payment event.
- middleware.ts (Vercel Routing Middleware) reports known AI crawler
requests via @datafast/ai-crawl 1.0.9 (zero deps, audited), scheduled with
waitUntil; no-op until DATAFAST_WEBSITE_ID, now set in production.
- scripts/datafast-funnels.mjs defines three funnels for the Account API.
Evidence (real DataFast script, events captured locally, nothing sent):
pageview, download_dmg{hero}, scroll_pricing, buy_pro_click{hero} before
navigation at 284ms, payment{polar_checkout_id} and license_key_copied on
the success page, zero cookies set.
Claude-Session: https://claude.ai/code/session_01CvRJfFeFvF96jhBFujxvHN
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The first preview build warned that Edge is deprecated for Routing Middleware and type-checking reported process as undeclared. Claude-Session: https://claude.ai/code/session_01CvRJfFeFvF96jhBFujxvHN
Returning undefined is not a pass-through on the Node.js runtime: the preview served 500 for matched pages. Return the empty response with x-middleware-next: 1, which is what next() from @vercel/functions returns. Claude-Session: https://claude.ai/code/session_01CvRJfFeFvF96jhBFujxvHN
On preview the Node.js runtime served every matched HTML page as 500 while the Edge build of the same middleware served 200. Keep the explicit pass-through response and the process type. Claude-Session: https://claude.ai/code/session_01CvRJfFeFvF96jhBFujxvHN
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What
load, served first-party viavercel.jsonrewrites.download_dmg,github_click,scroll_pricing,scroll_faq,buy_pro_click(click handler with a 250 ms hand-off so the goal is not cancelled by the checkout redirect),license_key_copied./buy/success(tag readscheckout_id).landing/middleware.ts;DATAFAST_WEBSITE_IDset in Vercel production.scripts/datafast-funnels.mjswith three funnels.Verification
Real DataFast cookieless script in Chromium against the served landing, events captured locally: pageview, download goal, scroll goal, buy goal sent before navigation (284 ms), payment attribution and copy goal on the success page, zero cookies. Prettier clean.
https://claude.ai/code/session_01CvRJfFeFvF96jhBFujxvHN