node js async context trace

context-test.ts

import { AsyncLocalStorage } from 'node:async_hooks'

const asyncLocalStorage = new AsyncLocalStorage<number>()

async function sleep(ms: number) {
  return new Promise(resolve => setTimeout(resolve, ms))
}
async function foo() {
  console.log('started')
  await sleep(1000)
  console.log(asyncLocalStorage.getStore())
}

for (let i = 0; i < 10; i++) {
  asyncLocalStorage.run(i, foo)
}

// output: started started started ... 0 1 2 3 4 5 6 7 8 9