10-fs-sync.js

const { readFileSync, writeFileSync } = require("fs")
console.log("start");

const first = readFileSync("./content/first.txt", "utf8")
const second = readFileSync("./content/second.txt", "utf8")

writeFileSync("./content/result-sync.txt", 
  `Here is the result ${first}, ${second}`, 
  {flag: "a"})

console.log("Done with this task")
console.log("Starting the next one")