onAuthStateChange()

Signature

massi.auth.onAuthStateChange(
  callback: (event: AuthChangeEvent, session: Session | null) => void
): { data: { subscription: Subscription } }

Example

const { data: { subscription } } = massi.auth.onAuthStateChange((event, session) => {
  if (event === 'SIGNED_IN') {
    console.log('User signed in:', session?.user.email)
  }
  if (event === 'SIGNED_OUT') {
    console.log('User signed out')
  }
  if (event === 'TOKEN_REFRESHED') {
    console.log('Token refreshed')
  }
})

// Later, clean up:
subscription.unsubscribe()

Events

Event	When it fires
SIGNED_IN	After signIn() or signUp() succeeds
SIGNED_OUT	After signOut() or token invalidation
TOKEN_REFRESHED	After the SDK automatically refreshes the token
USER_UPDATED	After user metadata changes

Notes

• Always call subscription.unsubscribe() on component unmount (React, Vue, Svelte) to avoid memory leaks.
• The callback fires once immediately with the current session state when subscribed.