This week's book giveaway is in the NodeJS forum. We're giving away four copies of Serverless Applications with Node.js and have Slobodan Stojanovic & Aleksandar Simovic on-line! See this thread for details.
Observer/Observable have been obsolete for a long time - it was about time they got officially deprecated. A similar purpose is served by event buses like https://github.com/greenrobot/EventBus, which is the approach I prefer these days. It provides more flexibility and features for little overhead, and is annotation-based rather than requiring listeners to be registered. Thus source and sink are completely independent of one another.
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