What's the proper way to handle back-pressure in a node.js Transform stream?

Question

Intro

These are my first adventures in writing node.js server side. It\'s been fun so far but I\'m having some difficulty understanding the proper way to implement

Answer 1

Ran into a similar problem lately, needing to handle backpressure in an inflating transform stream - the secret to handling push() returning false is to register and handle the 'drain' event on the stream

_transform(data, enc, callback) {
  const continueTransforming = () => {
    ... do some work / parse the data, keep state of where we're at etc
    if(!this.push(event)) 
         this._readableState.pipes.once('drain', continueTransforming); // will get called again when the reader can consume more data
    if(allDone)
       callback();
  }
  continueTransforming()
}

NOTE this is a bit hacky as we're reaching into the internals and pipes can even be an array of Readables but it does work in the common case of ....pipe(transform).pipe(...

Would be great if someone from the Node community can suggest a "correct" method for handling .push() returning false