posthog-analytics

# PostHog Analytics Skill For implementing product analytics with PostHog - event tracking, user identification, feature flags, and project-specific dashboards. **Sources:** [PostHog Docs](https://posthog.com/docs) | [Product Analytics](https://posthog.com/docs/product-analytics) | [Feature Flags](https://posthog.com/docs/feature-flags) --- ## Philosophy **Measure what matters, not everything.** Analytics should answer specific questions: - Are users getting value? (activation, retention) - Where do users struggle? (funnels, drop-offs) - What features drive engagement? (feature usage) - Is the product growing? (acquisition, referrals) Don't track everything. Track what informs decisions. --- ## Installation ### Next.js (App Router) ```bash npm install posthog-js ``` ```typescript // lib/posthog.ts import posthog from 'posthog-js'; export function initPostHog() { if (typeof window !== 'undefined' && !posthog.__loaded) { posthog.init(process.env.NEXT_PUBLIC_POSTHOG_KEY!, { api_host: process.env.NEXT_PUBLIC_POSTHOG_HOST || 'https://us.i.posthog.com', person_profiles: 'identified_only', // Only create profiles for identified users capture_pageview: false, // We'll handle this manually for SPA capture_pageleave: true, loaded: (posthog) => { if (process.env.NODE_ENV === 'development') { posthog.debug(); } }, }); } return posthog; } export { posthog }; ``` ```typescript // app/providers.tsx '...