const bash = (() => {
  const bashProc = spawn("bash");

  bashProc.stdout.on("data", (data: string) => {
    console.log(`stdout: ${data}`);
  });

  bashProc.stderr.on("data", (err: string) => {
    console.error(`stderr: ${err}`);
    throw Error(err);
  });

  bashProc.on("close", (code: string) => {
    console.log(`child process exited with code ${code}`);
  });

  return bashProc.stdin.write;
})();
bash('echo lll');

const bash = (() => {
  const bashProc = spawn("bash");

  bashProc.stdout.on("data", (data: string) => {
    console.log(`stdout: ${data}`);
  });

  bashProc.stderr.on("data", (err: string) => {
    console.error(`stderr: ${err}`);
    throw Error(err);
  });

  bashProc.on("close", (code: string) => {
    console.log(`child process exited with code ${code}`);
  });

  return bashProc.stdin.write;
})();
bash('echo lll');