无法理解此异步示例中的执行流

问：

我正在学习 javascript 和 nodejs，并且仍在为异步执行而苦苦挣扎

我知道以下代码远非最佳实践，但我需要了解为什么，根据是否调用 fileHandle.write（'[1]'），在调用 fileHandle.write（'[2]'） 时仍会打开文件。

我在nodejs文档中找到了这一点，我想它是相关的，但我想了解事情是如何工作的： “在同一个文件上多次使用 filehandle.write（） 而不等待承诺被解析（或拒绝）是不安全的。对于此方案，请使用 filehandle.createWriteStream（）。

代码没有错误：

import {createServer} from 'node:http'
import {open} from 'node:fs/promises'
import {write} from 'node:fs'
import {json} from 'node:stream/consumers'


const serveur = createServer(async (request,response) => {
    const path = './tp_CRUD/storage/my_file.json'
    const fileHandle = await open(path, 'w+')
    try {
        await fileHandle.read()
        .then(() => {
            fileHandle.write('[1]') // <= no error as the file is still opened at this point

            json(request) // promise parsing request content to json
            .then(() => {
                fileHandle.write('[2]') // <= no error as file is still open somehow thanks to [1] line
            })
        })
    } catch {
        console.log('error with POST request')
    } finally {
        fileHandle.close()
    }
    response.end()

})
serveur.listen('3000')

有错误的代码：

import {createServer} from 'node:http'
import {open} from 'node:fs/promises'
import {write} from 'node:fs'
import {json} from 'node:stream/consumers'


const serveur = createServer(async (request,response) => {
    const path = './tp_CRUD/storage/my_file.json'
    const fileHandle = await open(path, 'w+')
    try {
        await fileHandle.read()
        .then(() => {
            json(request) // promise parsing request content to json
            .then(() => {
                fileHandle.write('[2]') // <= error as file is closed despite being in the try{} block ??
            })
        })
    } catch {
        console.log('error with POST request')
    } finally {
        fileHandle.close()
    }
    response.end()

})
serveur.listen('3000')

这是调用堆栈，如果它能以某种方式提供帮助

node:internal/fs/promises:436
    const err = new Error('file closed');
                ^

Error: file closed
    at fsCall (node:internal/fs/promises:436:17)
    at FileHandle.write (node:internal/fs/promises:207:12)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  code: 'EBADF',
  syscall: 'write'
}

Node.js v21.1.0