feat: track anonymous user (#238)

Author: halionaz

src/util/AmplitudeProvider.tsx

@@ -5,8 +5,9 @@ import { useEffectOnce } from '@/util/hooks/useEffectOnce'
 const AmplitudeProvider = () => {
   const user = useUserData()
   useEffectOnce(() => {
-    if (!user) return
-    initAmplitude(user.id, () => setInitialUserProperties(user))
+    initAmplitude(user?.id, () => {
+      if (user) setInitialUserProperties(user)
+    })
   })
 
   return null

src/util/analytics/amplitude.ts

@@ -2,7 +2,7 @@ import { identify, Identify, init, setUserId } from '@amplitude/analytics-browse
 
 import { UserInfo } from '@/providers/UserProvider'
 
-export const initAmplitude = async (userId: string, callback?: () => void) => {
+export const initAmplitude = async (userId?: string, callback?: () => void) => {
   init(import.meta.env.VITE_API_AMPLITUDE_API_KEY, {
     userId,
     defaultTracking: true,