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analytics: cross-subdomain identity for the unified onboarding funnel #3968

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analytics: cross-subdomain identity for the unified onboarding funnel #3968

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7 changes: 7 additions & 0 deletions apps/mesh/src/web/lib/posthog-client.ts
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Expand Up @@ -21,6 +21,13 @@ export function initPostHog(key: string, host: string) {
if (initialized || typeof window === "undefined") return;
posthog.init(key, {
api_host: host,
// Persist the PostHog cookie on the `.decocms.com` root domain so a visitor
// is the SAME person across www.decocms.com (landing) and
// studio.decocms.com (this app). Required for the unified
// acquisition → signup funnel — both surfaces must share ONE project key
// for the cookie to match. posthog-js defaults this to true; pinned
// explicitly so it can't silently regress and break cross-domain identity.
cross_subdomain_cookie: true,
capture_pageview: "history_change",
capture_pageleave: true,
autocapture: true,
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