Howto combine TouchID <=> React Native <=> Amazon Cognito - react-native

has somebody, who read this, experience with authentication using your thumb,
TouchID, in a React Native App, which uses Amazon Cognito as authentication service?
I'm a newbie using React Native, and a real beginner using Cognito. Maybe someone knows a tutorial for this?
Thx :-)

A preview project which is using REACT NATIVE - COGNITO
https://github.com/awslabs/aws-sdk-react-native/tree/master/Core/example
Touch ID is not involved in this example.

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