App.tsx

import React, { useEffect, useState } from 'react';
import { Platform, Text, View } from 'react-native';

import Purchases, { PurchasesOffering } from 'react-native-purchases';

const APIKeys = {
  apple: "your_revenuecat_apple_api_key",
  google: "your_revenuecat_google_api_key",
};

export default function App() {
  const [currentOffering, setCurrentOffering] = useState<PurchasesOffering | null>(null);

  useEffect(() => {
    const setup = async () => {
      if (Platform.OS == "android") {
        await Purchases.configure({ apiKey: APIKeys.google });
      } else {
        await Purchases.configure({ apiKey: APIKeys.apple });
      }
      
      const offerings = await Purchases.getOfferings();
      setCurrentOffering(offerings.current);
    };

    Purchases.setDebugLogsEnabled(true);

    setup()
      .catch(console.log);
  }, []);

  if (!currentOffering) {
    return "Loading...";
  } else {
    return (
      <View>
        <Text>Current Offering: {currentOffering.identifier}</Text>
        <Text>Package Count: {currentOffering.availablePackages.length}</Text>
        {
          currentOffering.availablePackages.map((pkg) => {
            return <Text>{ pkg.product.identifier }</Text>
          })
        }
      </View>
    );
  }
}

Would be very important if u put here which was version "react-native-purchases" u used.

I mean, because on the actually version "react-native-purchases": "^6.3.0" I am having problem and same with my configs OK no RevenueCat, always I have a return null or [].

Error: There is an issue with your configuration. Check the underlying error for more details. There are no products registered in the RevenueCat dashboard for your offerings. If you don't want to use the offerings system, you can safely ignore this message. To configure offerings and their products, follow the instructions in https://rev.cat/how-to-configure-offerings.
More information: https://rev.cat/why-are-offerings-empty

L26: Purchases.setLogLevel(LOG_LEVEL.DEBUG);

L26: Purchases.setLogLevel(LOG_LEVEL.DEBUG);

I needed this: Purchases.setLogLevel(Purchases.LOG_LEVEL.DEBUG);

Purchases.configure is handled as a promise here, but the typescript typings shows it as having a void return type