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Subscribes to authentication state changes (sign-in, profile switch, sign-out). Fires immediately with current state, then again on every change. Use this to update your UI’s logged-in state and profile display.

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Parameters

NameTypeRequiredDescription
cb (TypeScript)callbackYesFunction called with { signedIn, profileId } whenever auth state changes.

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Returns

Unsubscribe — Function to call when you’re done listening. (TS only; Kotlin/Swift use Flow/AsyncStream lifecycle.)

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Example

const unsubscribe = client.onAuthStateChanged(({ signedIn, profileId }) => {
  if (signedIn) {
    console.log("Signed in, profile:", profileId);
  } else {
    console.log("Signed out — show login screen");
  }
});
// Cleanup: unsubscribe();