Async context tracking, async_hooks

Question

I'm trying to better understand the output from node async_hooks. It's not giving me the output I expect. Specifically, I'd expect that each new async function creates a new asynchronous context. So that all asynchronous processes spawned therein would have THAT (the function which starts the new process) as it's asyncTriggerId.

Can someone help clarify how to make this happen? Or where my expectations are misguided?

I have a basic example here:

import async_hooks from 'async_hooks';

const hook = async_hooks.createHook({
    init(asyncId, type, triggerAsyncId) {
        console.log(`[INIT] asyncId: ${asyncId}, type: ${type}, triggered by: ${triggerAsyncId}`);
    },
});

hook.enable();


async function A(){
    console.log("A");
    return await B();
}

async function B(){
    console.log("B")
    C();
    return "b";
}

async function C(){
    console.log("C")
    return "c";
}



function CALLBACK(){
    console.log("DONE");
    console.log(process.allPromises)
}

A().then(CALLBACK);

And the output is:

[INIT] asyncId: 6, type: PROMISE, triggered by: 1
[INIT] asyncId: 7, type: TickObject, triggered by: 1
A
[INIT] asyncId: 8, type: PROMISE, triggered by: 1
B
[INIT] asyncId: 9, type: PROMISE, triggered by: 1
C
[INIT] asyncId: 10, type: PROMISE, triggered by: 8
[INIT] asyncId: 11, type: PROMISE, triggered by: 6
DONE
[INIT] asyncId: 12, type: TickObject, triggered by: 11
undefined
[INIT] asyncId: 13, type: TickObject, triggered by: 11
[INIT] asyncId: 14, type: TickObject, triggered by: 11