• Version: v10.0.0
• Platform: Linux, Windows 10 WSL

Running the following code

const async_hooks = require("async_hooks");
const fs = require("fs");

async_hooks
  .createHook({
    init: (asyncId, type, triggerAsyncId, resource) => {
      fs.writeSync(1, `${triggerAsyncId} => ${asyncId}\n`);
    }
  })
  .enable();

async function main() {
  console.log("hello");
  await null;
  console.log("hello");
}

main();

on Node 9 gives the output

1 => 6
hello
1 => 7
6 => 8
8 => 9
hello
9 => 10

while on Node 10 it gives

1 => 6
hello
1 => 7
1 => 8
hello
1 => 9

That is, on Node 10, the triggerAsyncId is always 1, and I am unable to track which contexts follow from which other contexts.

Is one of these unexpected behavior? If the change is a known (undocumented?) new behavior, is there any way with Node 10 to achieve what I was doing under previous versions?