JavaScript Streams

 Streams—The definitive guide

"The Streams API allows you to programmatically access streams of data received over the network or created by whatever means locally and process them with JavaScript. Streaming involves breaking down a resource that you want to receive, send, or transform into small chunks, and then processing these chunks bit by bit. While streaming is something browsers do anyway when receiving assets like HTML or videos to be shown on webpages, this capability has never been available to JavaScript before fetch with streams was introduced in 2015."