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feat: add PostHog add-on (#317)
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‎.changeset/wicked-paws-live.md‎

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---
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'@tanstack/create': minor
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---
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Add PostHog add-on

‎packages/create/src/frameworks/react/add-ons/posthog/README.md‎

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## Setting up PostHog
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1. Create a PostHog account at [posthog.com](https://posthog.com)
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2. Get your Project API Key from [Project Settings](https://app.posthog.com/project/settings)
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3. Set `VITE_POSTHOG_KEY` in your `.env.local`
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### Optional Configuration
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- `VITE_POSTHOG_HOST` - Set this if you're using PostHog Cloud EU (`https://eu.i.posthog.com`) or self-hosting

‎packages/create/src/frameworks/react/add-ons/posthog/assets/_dot_env.local.append‎

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# PostHog configuration, get your key from https://app.posthog.com/project/settings
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VITE_POSTHOG_KEY=phc_xxx
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# Optional: PostHog API host (for self-hosted or EU cloud)
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# VITE_POSTHOG_HOST=https://us.i.posthog.com

‎packages/create/src/frameworks/react/add-ons/posthog/assets/src/integrations/posthog/provider.tsx‎

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import posthog from 'posthog-js'
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import { PostHogProvider as BasePostHogProvider } from '@posthog/react'
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import type { ReactNode } from 'react'
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if (typeof window !== 'undefined' && import.meta.env.VITE_POSTHOG_KEY) {
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posthog.init(import.meta.env.VITE_POSTHOG_KEY, {
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api_host: import.meta.env.VITE_POSTHOG_HOST || 'https://us.i.posthog.com',
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person_profiles: 'identified_only',
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capture_pageview: false,
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defaults: '2025-11-30',
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})
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}
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interface PostHogProviderProps {
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children: ReactNode
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}
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export default function PostHogProvider({ children }: PostHogProviderProps) {
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return <BasePostHogProvider client={posthog}>{children}</BasePostHogProvider>
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}

‎packages/create/src/frameworks/react/add-ons/posthog/assets/src/routes/demo/posthog.tsx‎

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import { createFileRoute, Link } from '@tanstack/react-router'
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import { usePostHog } from '@posthog/react'
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import { useState } from 'react'
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export const Route = createFileRoute('/demo/posthog')({
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component: PostHogDemo,
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})
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function PostHogDemo() {
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const posthog = usePostHog()
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const [eventCount, setEventCount] = useState(0)
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const posthogKey = import.meta.env.VITE_POSTHOG_KEY
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const isConfigured = Boolean(posthogKey) && posthogKey !== 'phc_xxx'
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const trackEvent = (
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eventName: string,
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properties?: Record<string, unknown>,
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) => {
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posthog.capture(eventName, properties)
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setEventCount((c) => c + 1)
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}
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return (
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<div className="min-h-screen bg-gray-900 text-white p-8">
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<div className="max-w-md mx-auto">
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<h1 className="text-3xl font-bold mb-6">PostHog Demo</h1>
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{!isConfigured && (
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<div className="mb-4 p-4 bg-yellow-900/50 border border-yellow-600 rounded-lg">
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<p className="text-yellow-200 text-sm">
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<strong>Warning:</strong> VITE_POSTHOG_KEY is not configured.
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Events won't be sent to PostHog. Add it to your{' '}
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<code className="bg-yellow-900 px-1 rounded">.env</code> file.
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</p>
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</div>
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)}
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<div className="bg-gray-800 rounded-lg p-6">
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<p className="text-gray-400 mb-4">
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Click the button below to send events to PostHog. Check your PostHog
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dashboard to see them appear in real-time.
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</p>
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<button
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onClick={() => trackEvent('button_clicked', { button: 'demo' })}
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className="w-full bg-cyan-600 hover:bg-cyan-700 px-4 py-3 rounded font-medium"
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>
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Track Click
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</button>
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{isConfigured && (
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<div className="mt-6 p-4 bg-gray-700 rounded">
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<p className="text-sm text-gray-400">Events sent this session:</p>
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<p className="text-4xl font-bold text-cyan-400">{eventCount}</p>
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</div>
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)}
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</div>
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<p className="mt-4 text-sm text-gray-400">
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Open your{' '}
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<a
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href="https://app.posthog.com/events"
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target="_blank"
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rel="noopener noreferrer"
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className="text-cyan-400 hover:text-cyan-300 underline"
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>
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PostHog Events
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</a>{' '}
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page to see these events appear.
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</p>
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<p className="mt-2 text-sm text-gray-400">
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Learn more in the{' '}
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<a
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href="https://posthog.com/docs/libraries/react"
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target="_blank"
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rel="noopener noreferrer"
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className="text-cyan-400 hover:text-cyan-300 underline"
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>
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PostHog React docs
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</a>
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.
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</p>
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<div className="mt-8">
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<Link to="/" className="text-cyan-400 hover:text-cyan-300">
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&larr; Back to Home
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</Link>
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</div>
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</div>
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</div>
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)
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}

‎packages/create/src/frameworks/react/add-ons/posthog/files.json‎

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[
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"src/integrations/posthog/provider.tsx",
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"src/routes/demo/posthog.tsx",
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"_dot_env.local.append"
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]

‎packages/create/src/frameworks/react/add-ons/posthog/info.json‎

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{
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"name": "PostHog",
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"description": "Product analytics, session replay, and feature flags",
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"phase": "add-on",
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"modes": ["file-router"],
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"type": "add-on",
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"category": "analytics",
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"color": "#1D4AFF",
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"priority": 20,
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"link": "https://posthog.com",
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"tailwind": true,
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"routes": [
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{
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"icon": "BarChart",
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"url": "/demo/posthog",
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"name": "PostHog",
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"path": "src/routes/demo/posthog.tsx",
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"jsName": "PostHogDemo"
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}
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],
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"integrations": [
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{
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"type": "provider",
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"jsName": "PostHogProvider",
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"path": "src/integrations/posthog/provider.tsx"
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}
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]
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}

‎packages/create/src/frameworks/react/add-ons/posthog/package.json‎

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{
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"dependencies": {
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"posthog-js": "^1.335.4",
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"@posthog/react": "^1.7.0"
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}
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}

‎packages/create/src/types.ts‎

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'monitoring',
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'cms',
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'api',
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'analytics',
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'i18n',
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'tooling',
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'other',

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