See a ReactJS demonstration using wj-config version 2 in beta, the next generation configuration system.
Remember that wj-config works as well in NodeJS, and is programmed in the exact same way. One configuration for all your JavaScript is now a thing.
Published via npmjs and source code available in GitHub.
Drag the left handle to the right to reveal the config.js module's source code.
IMPORTANT: Version 2 is in public beta. If you would like to contribute to its final shape, test now and open an issue in GitHub with your findings.