The Socket Mobile CaptureJS SDK is a dependency for React Native Capture SDK.
CaptureJS SDK is also used with a web application running in a browser.
Although it does provide a Capture() constructor, it should not be used in the case of a React Native application. Instead the React Native application should use CaptureRn() constructor.
The installation of CaptureJS is done automatically when installing the react-native-capture NPM package and therefore it does not require anything else to be done.
Aside of the constructor difference and the way of installing CaptureJS, everything else can be used.
More information about the CaptureJS API can be found here.