How to use the expo-local-authentication.supportedAuthenticationTypesAsync function in expo-local-authentication
To help you get started, we’ve selected a few expo-local-authentication examples, based on popular ways it is used in public projects.
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expo / expo / apps / native-component-list / src / screens / LocalAuthenticationScreen.tsx View on Github 
checkAuthenticationsTypes = async () => {
const result = await LocalAuthentication.supportedAuthenticationTypesAsync();
const stringResult = result
.map(type => {
switch (type) {
case LocalAuthentication.AuthenticationType.FINGERPRINT:
return 'FINGERPRINT';
case LocalAuthentication.AuthenticationType.FACIAL_RECOGNITION:
return 'FACIAL_RECOGNITION';
default:
throw new Error(`Unrecognised authentication type returned: '${type}'`);
}
})
.join(', ');
alert(stringResult ? `Available types: ${stringResult}` : 'No available authentication types!');
};expo-local-authentication
Provides an API for FaceID and TouchID (iOS) or the Fingerprint API (Android) to authenticate the user with a face or fingerprint scan.
