node-prop-types 15.6.0+ds-1 (amd64 binary) in ubuntu eoan

 You can use prop-types to document the intended types of properties passed to
 components. React (and potentially other libraries) will check props passed to
 your components against those definitions, and warn in development if they
 don’t match.
 .
 Node.js is an event-based server-side JavaScript engine.