fix: opt-in modal render time

src/components/AskForPushNotification.js

@@ -13,16 +13,23 @@ export default function AskForPushNotification(props) {
     dispatch(pushDismissOptInQuestion());
   };
 
-  if (!showOptIn) {
-    return null;
-  }
-  return (
+  const putDismissOptInQuestion = () => {
+    dispatch(pushDismissOptInQuestion());
+  };
+
+  const pushNotificationOptInModal = () => (
     <ActionModal
       title={t`Do you want to enable push notifications for this wallet?`}
       text={t`You can always change this later in the settings menu`}
       button={t`Yes, enable`}
-      onAction={() => onEnablePushNotifications()}
-      onDismiss={() => dispatch(pushDismissOptInQuestion())}
+      onAction={onEnablePushNotifications}
+      onDismiss={putDismissOptInQuestion}
     />
   );
+
+  if (showOptIn) {
+    return pushNotificationOptInModal();
+  }
+
+  return null;
 }

src/sagas/pushNotification.js

@@ -15,6 +15,7 @@ import {
   take,
   takeLatest,
   debounce,
+  spawn,
   delay,
 } from 'redux-saga/effects';
 import messaging from '@react-native-firebase/messaging';
@@ -315,12 +316,27 @@ export function* init() {
     }
   }
 
-  // If the user has not been asked yet, we should ask him if he wants to enable push notifications
-  // We should appear only once, so we should save the fact that the user has dismissed the question
-  const optInDismissed = STORE.getItem(pushNotificationKey.optInDismissed);
-  if (optInDismissed === null || !optInDismissed) {
-    yield put(pushAskOptInQuestion());
-  }
+  // Gives users the option to opt-in the Push Notification
+  // after its initialization, but only opens the opt-in
+  // modal after wallet become ready.
+  // Spwan creates a detached thread from this current thread.
+  yield spawn(function* handleOptIn() {
+    const { ready } = yield race({
+      ready: take(types.WALLET_STATE_READY),
+      // Do nothing with error, only terminates the thread.
+      error: take(types.WALLET_STATE_ERROR),
+    });
+
+    if (ready) {
+      // Ask user for push notification opt-in if it has not
+      // been asked previously. It appears only once because
+      // we persist the dismiss action on store.
+      const optInDismissed = STORE.getItem(pushNotificationKey.optInDismissed);
+      if (optInDismissed === null || !optInDismissed) {
+        yield put(pushAskOptInQuestion());
+      }
+    }
+  });
 }
 
 /**