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3-async.js

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'use strict';

const fs = require('node:fs');

fs.readFile('1-readFileSync.js', 'utf8', (err, data) => {

if (err) throw err;

console.log(`File size: ${data.length}`);

const lines = data.split('\n').filter((line) => !!line);

const content = lines.join('\n');

fs.writeFile('1-readFileSync.txt', content, (err) => {

if (err) throw err;

console.log(`New file size: ${content.length}`);

});

});

console.log('Read file async example');