With the new @babel/preset-env module, it is able to intellectually convert your next generation ECMAScript code to compatible syntax based on browser compatibility statistics. So you don't have to target specific browser versions anymore!
MongoDB Change Stream is a high-level API that allows you to subscribe to real-time notifications whenever there is a change in your MongoDB collections, databases, or the entire cluster, in an event-driven fashion.
mitmproxy is a free and open source interactive HTTPS proxy.
google-cloud, Python idiomatic clients for Google Cloud Platform services. There is an older Python library also officially supported by Google, google-api-python-client, which is in maintenance mode.
A replica set is a group of servers that maintain the same data set, with one primary which takes client requests, and multiple secondaries that keep copies of the primary's data. If the primary crashes, secondaries can elect a new primary from amongst themselves.