feat: added posthog

surfsense_web/lib/posthog/server.ts

@@ -0,0 +1,17 @@
+import { PostHog } from "posthog-node";
+
+export default function PostHogClient() {
+	if (!process.env.NEXT_PUBLIC_POSTHOG_KEY) {
+		throw new Error("NEXT_PUBLIC_POSTHOG_KEY is not set");
+	}
+
+	const posthogClient = new PostHog(process.env.NEXT_PUBLIC_POSTHOG_KEY, {
+		host: process.env.NEXT_PUBLIC_POSTHOG_HOST,
+		// Because server-side functions in Next.js can be short-lived,
+		// we set flushAt to 1 and flushInterval to 0 to ensure events are sent immediately
+		flushAt: 1,
+		flushInterval: 0,
+	});
+
+	return posthogClient;
+}