node-repl.js

const readline = require("readline")

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
})

const read = (query) => new Promise((r) => rl.question(query, r))
const print = console.log

async function loop() {
  const code = await read("> ")
  const ans = eval(code)

  print(ans)
  loop()
}

loop()