[SOLVED] package.json: how to test if node

Inside package.json, is it possible to test if node_modules directory exists? My goal is to print a message if node_module does not exists, something like:

node_module not existent: use npm run dist

where dist is a script inside scripts of my package.json. Thank you.

As suggested by B M in comments, I've created the following script named checkForNodeModules.js:

const fs = require('fs');
if (!fs.existsSync('./node_modules'))
  throw new Error(
    'Error: node_modules directory missing'
  );

And inside my package.json:

"scripts": {
  "node-modules-check": "checkForNodeModules.js",
  "start": "npm run node-modules-check && node start-app.js",
}

Thanks!

package.json: how to test if node_modules exists