Laughably simple module to test if the current environment is NodeJS or a Browser. This could be expanded upon in the future to include addition environment details, such as: NodeJS version, Browser agent-type, version, etc...
npm install detectify
Detectify currently returns an object with 3 properties: hasDetermined, isNodeJS, and isBrowser. All of these are booleans. To use, simply:
detection = require 'detectify' unless detection.hasDetermined throw new Error "Can't continue. Couldn't detect." if detection.isBrowser console.log "We're in a browser." else console.log "We're in NodeJS. Yay!"