You can contribute to the library functionality by forking the project, cloning your fork to your own local machine, and push your changes to your fork, and finally, creating a pull request back to the main repository.
The code can be cloned and tested as needed from the source code.
Clone the forked repository and go into directory
git clone https://github.com/jensstigaard/node-vmix.git
cd node-vmix
npm install # or 'yarn'
Compile TypeScript source code to JavaScript
npm run build # or 'yarn build'
Run tests
npm test # or 'yarn test'