Umbraco-CMS/tests/Umbraco.Tests.AcceptanceTest/postinstall.js

const fs = require('fs');

const configPath = './.env';

try {
  if (fs.existsSync(configPath)) {
    //file exists
    console.log("Skips configuration as file already exists, run 'npm run config' to change your configuration.");
  } else {
    require('./config.js');
  }
} catch(err) {
  console.error(err)
}