feat(analytics): PostHog support (#1072)

quartz/plugins/emitters/componentResources.ts

@@ -129,6 +129,13 @@ function addGlobalPageResources(ctx: BuildCtx, componentResources: ComponentReso
         "https://${cfg.analytics.websiteId}.${cfg.analytics.host ?? "goatcounter.com"}/count")
       document.head.appendChild(goatcounterScript)
     `)
+  } else if (cfg.analytics?.provider === "posthog") {
+    componentResources.afterDOMLoaded.push(`
+      const posthogScript = document.createElement("script")
+      posthogScript.innerHTML= \`!function(t,e){var o,n,p,r;e.__SV||(window.posthog=e,e._i=[],e.init=function(i,s,a){function g(t,e){var o=e.split(".");2==o.length&&(t=t[o[0]],e=o[1]),t[e]=function(){t.push([e].concat(Array.prototype.slice.call(arguments,0)))}}(p=t.createElement("script")).type="text/javascript",p.async=!0,p.src=s.api_host+"/static/array.js",(r=t.getElementsByTagName("script")[0]).parentNode.insertBefore(p,r);var u=e;for(void 0!==a?u=e[a]=[]:a="posthog",u.people=u.people||[],u.toString=function(t){var e="posthog";return"posthog"!==a&&(e+="."+a),t||(e+=" (stub)"),e},u.people.toString=function(){return u.toString(1)+".people (stub)"},o="capture identify alias people.set people.set_once set_config register register_once unregister opt_out_capturing has_opted_out_capturing opt_in_capturing reset isFeatureEnabled onFeatureFlags getFeatureFlag getFeatureFlagPayload reloadFeatureFlags group updateEarlyAccessFeatureEnrollment getEarlyAccessFeatures getActiveMatchingSurveys getSurveys onSessionId".split(" "),n=0;n<o.length;n++)g(u,o[n]);e._i.push([i,s,a])},e.__SV=1)}(document,window.posthog||[]);
+      posthog.init('${cfg.analytics.apiKey}',{api_host:'${cfg.analytics.host ?? "https://app.posthog.com"}'})\`
+      document.head.appendChild(posthogScript)
+    `)
   }
 
   if (cfg.enableSPA) {