Script to make TSC Watch and Nodemon play together swimmingly

dev.js

const { spawn } = require('child_process');
const { join } = require('path');
const chalk = require('chalk');

let tsc = null;
let nodemon = null;

function getTscPath() {
  return join(process.cwd(), 'node_modules', '.bin', 'tsc');
}

function getNodemonPath() {
  return join(process.cwd(), 'node_modules', '.bin', 'nodemon');
}

function watchTypescript() {
  return new Promise((resolve) => {
    tsc = spawn(getTscPath(), ['--watch']);
    tsc.stdout && tsc.stdout.on('data', (data) => {
      const output = data.toString();
      if (output.includes('Watching for file changes.')) {
        resolve();
      }
      if (output.includes('Found 0 errors')) {
        const message = chalk.bold.magentaBright(output);
        console.log(message);
      } else {
        const message = chalk.bold.red(output);
        console.log(message);
      }
    });
    tsc.stderr && tsc.stderr.on('data', (data) => {
      console.log('stderr: ', data.toString());
    });
  });
}

function watchNodemon() {
  const bootstrapPath = join(process.cwd(), 'dist', 'bootstrap.js');
  nodemon = spawn(getNodemonPath(), [bootstrapPath], { stdio: "inherit" });
  nodemon.stdout && nodemon.stdout.on('data', (data) => {
    console.log(data.toString());
  });
  nodemon.stderr && nodemon.stderr.on('data', (data) => {
    console.log(data.toString());
  });

}

let cleanupCalled = false;
function cleanup() {
  if (cleanupCalled) {
    return;
  }
  cleanupCalled = true;
  if (tsc) {
    console.log('Cleaning up tsc ...');
    tsc.kill();
    console.log('Cleaning up tsc ... DONE');
  }
  if (nodemon) {
    console.log('Cleaning up nodemon ...');
    nodemon.kill();
    console.log('Cleaning up nodemon ... DONE');
  }
  process.exit(0);
}

process.on('exit', cleanup);
process.on('SIGINT', cleanup);

process.stdin.resume();

async function beginListening() {
  console.log('Starting development mode with initial compile ...');
  await watchTypescript();
  watchNodemon();
}

beginListening();