joplin/packages/app-mobile/components/biometrics/sensorInfo.ts

import Setting from '@joplin/lib/models/Setting';
import FingerprintScanner from 'react-native-fingerprint-scanner';

export interface SensorInfo {
	enabled: boolean;
	sensorsHaveChanged: boolean;
	supportedSensors: string;
}

export default async (): Promise<SensorInfo> => {
	const enabled = Setting.value('security.biometricsEnabled');
	let hasChanged = false;
	let supportedSensors = '';

	if (enabled) {
		try {
			const result = await FingerprintScanner.isSensorAvailable();
			supportedSensors = result;

			if (result) {
				if (result !== Setting.value('security.biometricsSupportedSensors')) {
					hasChanged = true;
					Setting.setValue('security.biometricsSupportedSensors', result);
				}
			}
		} catch (error) {
			console.warn('Could not check for biometrics sensor:', error);
			Setting.setValue('security.biometricsSupportedSensors', '');
		}
	}

	return {
		enabled,
		sensorsHaveChanged: hasChanged,
		supportedSensors,
	};
};