fix: posthog api key issues.

.env.example

@@ -11,4 +11,3 @@ APPWRITE_DB_INIT_ID=
 APPWRITE_COL_INIT_ID=
 APPWRITE_API_KEY_INIT=
 SENTRY_AUTH_TOKEN=
-PUBLIC_POSTHOG_API_KEY=

src/lib/experiments.ts

@@ -1,10 +1,12 @@
 import { PUBLIC_POSTHOG_API_KEY } from '$env/static/public';
 import { PostHog } from 'posthog-node';
 
-export const posthogServerClient = new PostHog(PUBLIC_POSTHOG_API_KEY, {
+export const posthogServerClient = PUBLIC_POSTHOG_API_KEY
+    ? new PostHog(PUBLIC_POSTHOG_API_KEY, {
           host: 'https://eu.i.posthog.com',
           persistence: 'memory'
-});
+      })
+    : null;
 
 export const experiments = {
     'sticky-navigation_ab-test': ['control', 'sticky-nav']
@@ -24,7 +26,8 @@ export const getFeatureFlag = async <K extends Key>(
     variant: (typeof experiments)[K][number],
     distinctId: string
 ) => {
-    const flagData = await posthogServerClient.getFeatureFlag(key, distinctId);
+    /* experiments won't work on previews or on local if api key is not available */
+    const flagData = (await posthogServerClient?.getFeatureFlag(key, distinctId)) ?? false;
 
     return isFlagEqualTo(variant, flagData);
 };

src/routes/+layout.ts

@@ -3,7 +3,7 @@ import { PUBLIC_POSTHOG_API_KEY } from '$env/static/public';
 import posthog from 'posthog-js';
 
 export const load = async ({ data }) => {
-    if (browser) {
+    if (browser && PUBLIC_POSTHOG_API_KEY) {
         posthog.init(PUBLIC_POSTHOG_API_KEY, {
             api_host: 'https://eu.i.posthog.com',
             persistence: 'memory',