For implementing barcode scanning in React Native without Expo, you have two main options: React Native Vision Camera, a free, open-source solution good for basic scanning and prototypes, and commercial SDKs like Scanbot (disclosure: I work there), which are better suited for production apps needing reliable scanning and enterprise support. Let me show you how to implement both.

1. React Native Vision Camera (Open Source)

This is a popular, actively maintained library that provides basic barcode scanning capabilities. It's free and integrates well with React Native:

import { Camera, useCodeScanner } from 'react-native-vision-camera';

const App: React.FC = () => {
  const codeScanner = useCodeScanner({
    codeTypes: ['ean-13'],
    onCodeScanned: (codes) => {
      for (const code of codes) {
        console.log(`Code Value: ${code.value}`);
      }
    },
  });

  return (
    <Camera
      style={StyleSheet.absoluteFill}
      device={device}
      isActive={true}
      frameProcessorFps={2}
      codeScanner={codeScanner}
    />
  );
};

Here's the link to a complete step-by-step guide for barcode scanning with React Native Vision Camera.

2. Scanbot SDK (Commercial)

For more robust scanning requirements, here's how you'd implement scanning with our SDK. It comes with pre-built UI for single-scanning or multi-scanning, and can be integrated in a few minutes:

import ScanbotBarcodeSDK, {
  BarcodeScannerConfiguration,
  SingleScanningMode,
  startBarcodeScanner
} from 'react-native-scanbot-barcode-scanner-sdk';

const App: React.FC = () => {
  const startScanning = async () => {
    const config = new BarcodeScannerConfiguration();
    config.useCase = new SingleScanningMode();
    
    const result = await startBarcodeScanner(config);
    if (result.status === 'OK' && result.data) {
      console.log(result.data.items.map(barcode => 
        `Value: ${barcode.text}, Type: ${barcode.type}`
      ));
    }
  };

  return (
    <Button title="Start Scanning" onPress={startScanning} />
  );
};

Here's the link to a complete step-by-step Scanbot SDK integration guide. It also covers customization options. This tutorial uses Expo, but the SDK can also be integrated without a framework.