callback.mjs

import fs from "node:fs";

//FILE LOGGER
const content='node js is a fun but i am still having problem with the low level fs methods mostly things partaining POSIX'
const directory='/content/subfolder/logger.txt'
function closeFd(fd) {
    fs.close(fd, (err) => {
        if (err) throw err;
    })
}
fs.open(directory,(err,dd)=>{
        const fd=dd
        if (err) {
            if (err.code==='ENOENT') {
                fs.writeFile(directory,content,(err)=>console.log(`unable to writeFile ${err}`))
                closeFd(fd)
            }else{
                throw err 
            }
        }
        closeFd(fd)
    })

async function appending(path) {
    const timestamp= await time()
    fs.open(path,(err,fd)=>{
        if(!err){
            try {
                fs.appendFile(fd,timestamp,'utf8',(err)=>{
                    if(err){
                        closeFd(fd)
                        throw err
                    }
                    console.log('appending sucess');
                    closeFd(fd)
                })
            } catch (err) {
                closeFd(fd)
                throw err
            }
        }else{
            closeFd(fd)
            console.log(`file missing ${err}`);
        }
    })
}
async function time() {
    const timestamp=`log entry at: ${Date.now()}/n`
    return timestamp
}
appending(directory)
fs.readFile(directory,(err,data)=>{
    if(err){
        throw err
    }else{
        console.log(data)
    }
})