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feat: migrate analytics from Mixpanel to PostHog #9

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Merged
enzoftware merged 1 commit into from
Sep 23, 2026
Merged

feat: migrate analytics from Mixpanel to PostHog #9

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8 changes: 5 additions & 3 deletions .env.example
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
# Mixpanel project token (client-side, public). Copy to .env and fill in.
# Get it from: https://mixpanel.com/settings/project (Access Keys → Project Token)
PUBLIC_MIXPANEL_TOKEN=
# PostHog project API key (client-side, public). Copy to .env and fill in.
# Get it from: PostHog → Project settings → Project API key (starts with phc_)
PUBLIC_POSTHOG_KEY=
# Ingestion host. Swap for a reverse-proxy domain later if needed.
PUBLIC_POSTHOG_HOST=https://us.i.posthog.com
4 changes: 4 additions & 0 deletions .github/workflows/deploy.yml
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Expand Up @@ -26,6 +26,10 @@ jobs:

- name: Install, build, and upload your site
uses: withastro/action@v3
env:
# Public client key, set under Settings → Secrets and variables → Actions → Variables.
PUBLIC_POSTHOG_KEY: ${{ vars.PUBLIC_POSTHOG_KEY }}
PUBLIC_POSTHOG_HOST: ${{ vars.PUBLIC_POSTHOG_HOST }}
# with:
# path: . # The root location of your Astro project inside the repository.
# node-version: 20 # The specific version of Node that should be used to build your site. Defaults to 20. (optional)
Expand Down
3 changes: 1 addition & 2 deletions package.json
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Expand Up @@ -28,8 +28,8 @@
"class-variance-authority": "^0.7.1",
"clsx": "^2.1.1",
"lucide-react": "^0.468.0",
"mixpanel-browser": "^2.79.0",
"motion": "^13.4.2",
"posthog-js": "^1.434.11",
"react": "^18.3.1",
"react-dom": "^18.3.1",
"tailwind-merge": "^2.6.0"
Expand All @@ -42,7 +42,6 @@
"@storybook/addon-themes": "^10.1.11",
"@storybook/react": "^10.1.11",
"@storybook/react-vite": "^10.1.11",
"@types/mixpanel-browser": "^2.66.0",
"@types/node": "^25.0.9",
"@types/react": "^18.3.16",
"@types/react-dom": "^18.3.5",
Expand Down
9 changes: 9 additions & 0 deletions src/env.d.ts
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@@ -1 +1,10 @@
/// <reference types="astro/client" />

interface ImportMetaEnv {
readonly PUBLIC_POSTHOG_KEY?: string;
readonly PUBLIC_POSTHOG_HOST?: string;
}

interface ImportMeta {
readonly env: ImportMetaEnv;
}
44 changes: 13 additions & 31 deletions src/layouts/BaseLayout.astro
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Expand Up @@ -163,7 +163,6 @@ const spanishKeywords =
grantConsent,
denyConsent,
getConsent,
hasConsent,
track,
setSuperProps,
} from '@/lib/analytics';
Expand All @@ -179,8 +178,6 @@ const spanishKeywords =
const scrollMilestones = new Set<number>();
let pageEnterAt = performance.now();
let maxScrollDepth = 0;
let lastVisibleSince = pageEnterAt;
let hiddenAccumMs = 0;
let engagedFired = false;

function currentPageProps() {
Expand Down Expand Up @@ -208,27 +205,17 @@ const spanishKeywords =
});
}

function flushPageExit(reason: 'unload' | 'navigate') {
// Time on page and max scroll ride on PostHog's native $pageleave;
// this only flushes pending section dwell times.
function flushSections() {
const now = performance.now();
if (document.visibilityState === 'visible') {
hiddenAccumMs += 0;
}
const totalMs = now - pageEnterAt;
const activeMs = totalMs - hiddenAccumMs;
sectionStates.forEach((s) => {
if (s.firstSeenAt != null) {
s.dwellMs += now - s.firstSeenAt;
s.firstSeenAt = null;
}
emitSection(s);
});
track('page_exited', {
reason,
time_on_page_ms: Math.round(totalMs),
active_time_ms: Math.round(Math.max(activeMs, 0)),
max_scroll_depth: maxScrollDepth,
...currentPageProps(),
});
}

function bindScrollDepth() {
Expand Down Expand Up @@ -305,13 +292,16 @@ const spanishKeywords =
const onClick = (ev: MouseEvent) => {
const t = ev.target as HTMLElement | null;
if (!t) return;
// Clicks are PointerEvents in modern browsers: "touch" | "mouse" | "pen".
const pointerType = (ev as PointerEvent).pointerType || null;
const cta = t.closest<HTMLElement>('[data-track-cta]');
if (cta) {
const ctx = ctaContext(cta);
const href = cta.getAttribute('href');
track('cta_clicked', {
...ctx,
destination: href,
pointer_type: pointerType,
modifier_key: ev.metaKey || ev.ctrlKey ? 'meta' : ev.shiftKey ? 'shift' : null,
...currentPageProps(),
});
Expand All @@ -325,6 +315,7 @@ const spanishKeywords =
track('contact_intent', {
method: cta.dataset.trackCta || 'email_click',
section: ctx.section,
pointer_type: pointerType,
});
}
}
Expand All @@ -340,6 +331,7 @@ const spanishKeywords =
href,
host: url.host,
section: section?.dataset.trackSection || null,
pointer_type: pointerType,
});
}
} catch {
Expand All @@ -350,6 +342,7 @@ const spanishKeywords =
track('contact_intent', {
method: 'email_click',
section: section?.dataset.trackSection || null,
pointer_type: pointerType,
});
}
}
Expand All @@ -362,24 +355,20 @@ const spanishKeywords =
const onVisibility = () => {
const now = performance.now();
if (document.visibilityState === 'hidden') {
hiddenAccumMs += now - lastVisibleSince;
sectionStates.forEach((s) => {
if (s.firstSeenAt != null) {
s.dwellMs += now - s.firstSeenAt;
s.firstSeenAt = null;
}
});
track('page_hidden', { active_time_ms: Math.round(now - pageEnterAt - hiddenAccumMs) });
} else {
lastVisibleSince = now;
sectionStates.forEach((s, el) => {
const rect = (el as HTMLElement).getBoundingClientRect();
const vh = window.innerHeight;
const visibleRatio =
Math.max(0, Math.min(rect.bottom, vh) - Math.max(rect.top, 0)) / vh;
if (visibleRatio >= 0.35 && !s.emitted) s.firstSeenAt = now;
});
track('page_visible');
}
};
document.addEventListener('visibilitychange', onVisibility);
Expand All @@ -402,7 +391,6 @@ const spanishKeywords =
if (btn.dataset.consent === 'grant') {
grantConsent();
track('consent_granted');
track('page_viewed', currentPageProps());
} else {
denyConsent();
}
Expand All @@ -419,8 +407,6 @@ const spanishKeywords =
function startTrackingForPage() {
pageEnterAt = performance.now();
maxScrollDepth = 0;
hiddenAccumMs = 0;
lastVisibleSince = pageEnterAt;
engagedFired = false;
scrollMilestones.clear();
sectionStates.clear();
Expand All @@ -430,18 +416,14 @@ const spanishKeywords =
viewport_height: window.innerHeight,
});

if (hasConsent()) {
track('page_viewed', currentPageProps());
}

cleanups.push(bindScrollDepth());
cleanups.push(bindSectionObserver());
cleanups.push(bindClickDelegation());
cleanups.push(bindVisibility());
}

function stopTrackingForPage(reason: 'unload' | 'navigate') {
flushPageExit(reason);
function stopTrackingForPage() {
flushSections();
cleanups.forEach((fn) => fn());
cleanups = [];
}
Expand All @@ -455,11 +437,11 @@ const spanishKeywords =
if (document.readyState !== 'loading') boot();
else document.addEventListener('DOMContentLoaded', boot);

document.addEventListener('astro:before-swap', () => stopTrackingForPage('navigate'));
document.addEventListener('astro:before-swap', stopTrackingForPage);
document.addEventListener('astro:page-load', () => {
if (cleanups.length === 0) startTrackingForPage();
});
window.addEventListener('pagehide', () => flushPageExit('unload'), { once: false });
window.addEventListener('pagehide', flushSections);
</script>

<script>
Expand Down
76 changes: 39 additions & 37 deletions src/lib/analytics.ts
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Original file line number Diff line number Diff line change
@@ -1,7 +1,8 @@
import mixpanel, { type Dict } from 'mixpanel-browser';
import posthog, { type Properties } from 'posthog-js';

const CONSENT_KEY = 'bx_analytics_consent';
const TOKEN = import.meta.env.PUBLIC_MIXPANEL_TOKEN as string | undefined;
const KEY = import.meta.env.PUBLIC_POSTHOG_KEY as string | undefined;
const HOST = (import.meta.env.PUBLIC_POSTHOG_HOST as string | undefined) || 'https://us.i.posthog.com';
const IS_PROD = import.meta.env.PROD;

export type ConsentState = 'granted' | 'denied' | 'unset';
Expand All @@ -22,7 +23,7 @@ function writeConsent(state: Exclude<ConsentState, 'unset'>) {
}
}

function deriveSuperProps(): Dict {
function deriveSuperProps(): Properties {
const nav = typeof navigator !== 'undefined' ? navigator : undefined;
const conn = nav && (nav as unknown as { connection?: { effectiveType?: string; saveData?: boolean } }).connection;
const win = typeof window !== 'undefined' ? window : undefined;
Expand All @@ -42,51 +43,51 @@ function deriveSuperProps(): Dict {
};
}

function parseUtm(): Dict {
if (typeof window === 'undefined') return {};
const params = new URLSearchParams(window.location.search);
const out: Dict = {};
for (const key of ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content']) {
const v = params.get(key);
if (v) out[key] = v;
}
const ref = document.referrer || null;
if (ref) {
out.referrer = ref;
// PostHog captures utm_* and referrer on its own; this collapses them into a
// single breakdown-friendly value: utm_source → referrer host → "direct".
function deriveTrafficSource(): string {
const utm = new URLSearchParams(window.location.search).get('utm_source');
if (utm) return utm;
if (document.referrer) {
try {
out.referrer_host = new URL(ref).host;
const host = new URL(document.referrer).host;
if (host !== window.location.host) return host;
} catch {
/* malformed referrer */
}
}
return out;
return 'direct';
}

export function initAnalytics(): boolean {
if (initialized) return true;
if (!IS_PROD) return false;
if (!TOKEN) {
console.warn('[analytics] PUBLIC_MIXPANEL_TOKEN not set; Mixpanel disabled.');
if (!KEY) {
console.warn('[analytics] PUBLIC_POSTHOG_KEY not set; PostHog disabled.');
return false;
}

mixpanel.init(TOKEN, {
debug: false,
track_pageview: false,
posthog.init(KEY, {
api_host: HOST,
defaults: '2026-05-30',
person_profiles: 'identified_only',
persistence: 'localStorage',
ignore_dnt: false,
opt_out_tracking_by_default: true,
api_host: 'https://api.mixpanel.com',
capture_pageview: 'history_change',
capture_pageleave: true,
disable_session_recording: true,
// Unused features; skipping them keeps pre-consent network traffic minimal.
disable_surveys: true,
advanced_disable_flags: true,
opt_out_capturing_by_default: true,
});

mixpanel.register(deriveSuperProps());
mixpanel.register_once(parseUtm());
posthog.register(deriveSuperProps());
posthog.register_once({ traffic_source: deriveTrafficSource() });

const consent = readConsent();
if (consent === 'granted') {
mixpanel.opt_in_tracking();
if (readConsent() === 'granted') {
posthog.opt_in_capturing({ captureEventName: null });
} else {
mixpanel.opt_out_tracking();
posthog.opt_out_capturing();
}

initialized = true;
Expand All @@ -104,24 +105,25 @@ export function getConsent(): ConsentState {
export function grantConsent() {
writeConsent('granted');
if (initialized) {
mixpanel.opt_in_tracking();
mixpanel.register(deriveSuperProps());
posthog.register(deriveSuperProps());
// Also sends the initial $pageview that was held back while opted out.
posthog.opt_in_capturing({ captureEventName: null });
}
}

export function denyConsent() {
writeConsent('denied');
if (initialized) {
mixpanel.opt_out_tracking();
posthog.opt_out_capturing();
}
}

export function track(event: string, props?: Dict) {
export function track(event: string, props?: Properties) {
if (!initialized || !hasConsent()) return;
mixpanel.track(event, props);
posthog.capture(event, props);
}

export function setSuperProps(props: Dict) {
export function setSuperProps(props: Properties) {
if (!initialized) return;
mixpanel.register(props);
posthog.register(props);
}
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