Add posthog global types

Author: samholmes

src/types/posthog.d.ts

@@ -0,0 +1,8 @@
+import type { PostHog } from 'posthog-react-native'
+
+declare global {
+  // Expose the analytics instance on the global scope for app-wide use
+  // The PostHog instance is initialized at runtime
+  // See src/util/tracking.ts for initialization
+  var posthog: PostHog | undefined
+}

src/util/tracking.ts

@@ -171,7 +171,6 @@ if (ENV.POSTHOG_INIT != null) {
 
   posthogAsync
     .then(client => {
-      // @ts-expect-error Attach PostHog instance to global for analytics access
       global.posthog = client
     })
     .catch((e: unknown) => {
@@ -408,10 +407,8 @@ async function logToPosthog(
   event: TrackingEventName,
   values: TrackingValues
 ): Promise<void> {
-  // @ts-expect-error PostHog is attached to global at runtime
   if (global.posthog == null) return
 
-  // @ts-expect-error PostHog is attached to global at runtime
   global.posthog.capture(event, values)
 }