App for testing Merlin protocol

app.js

// The goal here is to print Merlin version 3 times. To test sync/async support.

const { spawn } = require("child_process");

const mp = spawn("ocamlmerlin");

let i = 0;

mp.stdin.write('["protocol","version"]');

mp.stdout.on("data", data => {
  console.log(`stdout: -----START -----\n${data}---------------------`);
  if (i < 2) {
    mp.stdin.write('["protocol","version"]');
    i++;
  }
});
mp.stderr.on("data", data => {
  console.log(`stderr: ${data}`);
});
mp.on("close", code => {
  console.log(`child process exited with code ${code}`);
});