// console.log("Hello, World!");
// module1.js
// require('./module2')
// console.log('Inside Module1')

// // module2.js
// require('./module1')
// console.log('Inside Module2')



// const fs = require('fs'); 
// const eventemitter require('events'); 
// const readfile = async filepath => {
//   try { 
//     const data = await fs.promises.readfile(filepath, 'utf8'); 
//     return data; 
     
//   }  catch(err) { 
// console.log(err); } 
  
// } 
// class readevents extends eventemitter ( async execute(asyncfunc, ...args) { 15 16 17 this.emit ('begin'); try { const data = await asyncfunc(...args); this.emit('data', data); this.emit('end'); 18 19 20 21 22 23 24 25 } } 26) 28 27 const readevents = new readevents(); console.log('an error occurred');▷ this.emit ('error', err); } catch(err) { 29 readevents.on('begin', () => console.log('about to execute')); 30 readevents.on('end', () => console.log('done with execute')); 31 readevents.on('data', (data) => console.log('data:', data)); 32 33 readevents.execute(readfile, './data.txt');


// import express from 'express'; 
// import fs from 'fs'; 
// const app = express();
// const fspromises = fs.promises; 
// app.get('/download', (req, res, next) => {
//   fspromises.readfile('./file-not-exists.txt')
//   .then(data => res.send(data)) })
//   .catch(err => next(err));
//   }) 
  
//   app.use((err, req, res, next) => { 
    
//     console.log('error middleware - one'); 
//     next(err); 
//     }); 
    
//     bapp.use((err, req, res, next) => { 
//       console.log('error middleware - two'); 
//       res.status(500); 
//       }); 
    
//     res.send('internal server error'); 
//     app.use((err, req, res, next) => { 5 26 }); console.log('error middleware - three'); 57 28 app.listen(3009);


// const add = (x,y) => x+y

// module.exports.addition = add

// module.exports ={
// add
// }

// exports ={
// add
// }

// exports.additionOp = add


// try{
//   require('./index1')
//   require('./index1')
//   require('./index1')
  
// } catch (err){
//   console.log("error")
//   throw new Error()
// }

// const fs require("fs").promises; 
// process.on("uncaughtexception", (err) => { console.log(caught exception: $(err)); 
// process.exit(1); }); 

// async function createcsv() { 
  
//   try { const csvheaders = "driver, team, points"; 
//   await fs.writefile("formula1.csv", csvheaders); }
//   catch (error) { console.error("got an error trying to write to a file: $[error.message)"); }
  
//   async function addream(driver, team, points) { try { 
//     const csvline = "\n$(driver), $(team), $(points)";
//     await fs.writefile("formula1.csv", csvline, { flag: "a" }); 
    
//   } catch (error) { console.error("got an error trying to write to a file: ${error.message)"); } }
  
//   async function read(sv() { await fs.readfile("filedoesnotexist.csv"); } (async function () { await createcsv(); await addteam("max", "redbull", 100); await readcsv(); await addteam("lewis", "mercedes", 103);


// const fs = require("fs"); 
// const zlib = require("zlib"); 
// const file = 'hello world';
// const { transform } = require("stream"); 
// const printprogress = new transform({ 
//   transform(chunk, encoding, callback) {
//     process.stdout.write("processing\n"); 
//     callback(null, chunk); } }); 
    
//     fs.createreadstream(file) 
//     .pipe(zlib.creategzip()) 
//     .pipe(printprogress) 
//     .pipe(fs.createwritestream(file + ".zip")) 
//     .on("finish", () => console.log("file processing complete"));


const{spawn}=require("child process');
const files=spawn("find . -type f | wc -1");
console.log(`number of files ${files}) ;